The one thing I dislike about the Go920 is the lack of screen brightness, there are times when it is totally worthless for me. However, I did find the following scheme works best, and I continue to try every bright screen I can find.
bike.clr
255,255,255 // background
255,255,255 // built-up area (city)
109,150,199 // water solid
051,153,102 // park
204,255,204 // woodland
245,248,202 // beach/dune/sand
255,255,255 // industrial zone
225,225,225 // harbor/marina
209,216,084 // moor/heath
209,216,084 // marsh
150,204,214 // pedestrian zone
192,192,192 // airport
255,255,255 // runway
000,000,000 // route background ('below' the road)
000,000,255 // route foreground (on top of the road)
255,000,000 // blocked road (dotted on top of any road)
255,255,000 // traffic jam (dotted on top of any road)
247,246,050 // highlighted / selected (line on top of any road)
255,255,153 // unreachable / not allowed to drive (dotted on top of any road)
255,000,000 // motorway solid
102,000,000 // motorway edge
255,000,000 // motorway inside
000,000,000 // motorway text
153,000,000 // major/international road solid
153,000,000 // major/international road edge
255,000,000 // international road inside
255,000,000 // major road inside
000,000,000 // major road text
255,000,000 // secondary road small
255,000,000 // secondary road solid
051,102,255 // secondary road edge
051,102,255 // secondary road inside
000,000,000 // secondary road text
255,000,000 // connecting road small
255,000,000 // connecting road solid
102,000,000 // connecting road edge
000,000,255 // connecting road inside
000,000,000 // connecting road text
255,000,000 // (major)local road small
051,102,255 // major local road solid
051,102,255 // local road solid
000,255,255 // local/destination road edge
051,102,255 // local/destination road inside
000,000,000 // local road text
051,102,255 // destination road solid
000,000,000 // destination road text
028,049,147 // ferry background
239,238,238 // ferry dots
000,000,000 // ferry text
022,010,103 // railroad dashed A
255,102,000 // railroad dashed B
028,049,147 // water edge outlines
000,000,000 // borders (dot-dash)
255,255,000 // arrows (road direction)
000,000,000 // arrows border (road direction)
255,255,000 // Route indication arrow color, normal
255,255,000 // Route indication arrow color, highlighted
000,000,000 // Tollroad edge color
255,000,255 // Tollroad inside color
000,000,092 // NavView: status/safeview panel background (default:dark blue)
000,000,128 // NavView: status/safeview panel borders (default:blue)
255,255,255 // NavView: status/safeview panel text (default:white)
206,207,255 // NavView: status/safeview panel dim text (default:lightblue)
000,000,092 // NavView: next highway background
255,255,255 // NavView: next highway border
255,255,255 // NavView: next highway text / iRouteDirectionArrowColor
000,128,000 // NavView: next highway EXIT background
255,255,255 // NavView: next highway EXIT border
255,255,255 // NavView: next highway EXIT text
095,100,215 // NavView: routeplanning progressbar color
000,153,000 // Distant route color
204,204,204 // EFaceTypeBuilding // Additional face types
204,204,204 // EFaceTypeSuburbs
204,204,204 // EFaceTypeCompanyGround
204,204,204 // EFaceTypeFreeport
208,238,119 // EFaceTypeAmusementParkGround
208,238,119 // EFaceTypeCampingSiteGround
204,204,204 // EFaceTypeCastleGround
204,204,204 // EFaceTypeChurchGround
208,238,119 // EFaceTypeGolfCourseGround
204,204,204 // EFaceTypeGovernmentBuildingGround
208,238,119 // EFaceTypeHolidayAreaGround
204,204,204 // EFaceTypeHospitalGround
204,204,204 // EFaceTypeHotelMotelGround
204,204,204 // EFaceTypeLibraryGround
204,204,204 // EFaceTypeMuseumGround
182,214,086 // EFaceTypeNatureReserveGround
204,204,204 // EFaceTypeParkingAreaGround
204,204,204 // EFaceTypePetrolStationGround
204,204,204 // EFaceTypePlaceOfInterestBuilding
204,204,204 // EFaceTypeMonumentGround
204,204,204 // EFaceTypeRailwayStationGround
208,238,119 // EFaceTypeRecreationalAreaGround
204,204,204 // EFaceTypeRestaurantGround
208,238,119 // EFaceTypeRestAreaGround
168,168,168 // EFaceTypeRocksGround
204,204,204 // EFaceTypeSportsHallGround
204,204,204 // EFaceTypeStadiumGround
204,204,204 // EFaceTypeUniversityCollegeGround
208,238,119 // EFaceTypeWalkingTerrainGround
208,238,119 // EFaceTypeZooGround
204,204,204 // EFaceTypeInstitution
204,204,204 // EFaceTypeOtherLanduse
208,238,119 // EFaceTypeCemeteryGround
204,204,204 // EFaceTypeMilitaryTerritory
204,204,204 // EFaceTypeShoppingCenterGround
204,204,204 // EFaceTypeAgriculture // Corine face types
204,204,204 // EFaceTypeVineyards
204,204,204 // EFaceTypeFruitTrees
204,204,204 // EFaceTypeOliveGroves
204,204,204 // EFaceTypePastures
182,214,086 // EFaceTypeBroadleavedForest
182,214,086 // EFaceTypeConiferousForest
182,214,086 // EFaceTypeMixedForest
182,214,086 // EFaceTypeScrub
168,168,168 // EFaceTypeRocks
200,200,200 // EFaceTypeGlaciersSnow
168,168,200 // EFaceTypeIntertidalFlats
255,255,255 // EFaceTypeTownblockCityBlock // City map face types
255,255,153 // EFaceTypeTownblockSandArea
209,216,084 // EFaceTypeTownblockMarsh
182,214,086 // EFaceTypeTownblockForest
204,204,204 // EFaceTypeTownblockGrass
208,238,119 // EFaceTypeTownblockPlantedArea
109,150,199 // EFaceTypeTownblockWaterSystem
208,238,119 // EFaceTypeTownblockBankArea
109,150,199 // EFaceTypeTownblockSwimmingPool
255,153,153 // EFaceTypeTownblockHighWay
255,153,153 // EFaceTypeTownblockNationalRoute
255,153,153 // EFaceTypeTownblockPrincipalRoad
255,153,153 // EFaceTypeTownblockOtherRoad
255,255,255 // EFaceTypeTownblockWalkWay
255,153,153 // EFaceTypeTownblockGardenPath
255,153,153 // EFaceTypeTownblockTunnel
255,153,153 // EFaceTypeTownblockMediumStrip
255,255,255 // EFaceTypeTownblockHospital
255,255,255 // EFaceTypeTownblockSchool
255,255,255 // EFaceTypeTownblockFactory
100,100,150 // EFaceTypeTownblockDam
255,153,153 // EFaceTypeTownblockRailwayGround
255,153,153 // EFaceTypeTownblockPavedArea
255,255,255 // EFaceTypeTownblockIncompleteArea
204,204,204 // EFaceTypeRailRoadStation
204,204,204 // EFaceTypeHospital
204,204,204 // EFaceTypeSchool
204,204,204 // EFaceTypeFactory
204,204,204 // EFaceTypePlaceOfWorship
204,204,204 // EFaceTypeCulturalFacility
I don't know how to share it other than post it as it is here
on edit: I also use 3D and a big yellow pointer for the icon, seems to show up better than in 2D