Remember Synthwood - the company that offers custom woodworking for synths?
They are also offering a pitch/mod wheel colorizer mod:

Available for the synthwood Pro-One wood case conversion kit
Comptabile with the DSI Prophet ‘08 (shown), DSI Poly Evolver, Moog Voyager
User selectable colors: Red, Green, Blue, White, Violet, Yellow, Turquoise and off
Colors can be independently set
synthwood figured maple [...]

Synthwood specializes in custom woodworking for synths.
Their creations include:

Custom Sequential Circuits Prophet T8
Custom Sequential Circuits Pro One Conversion Kit
Custom Sequential Circuits Multi-Trak
Replacement Nameplates
New Mini Moog wood cases
Korg MonoPoly and Polysix cases
Wall mountable cable holder

via Matrix