Looks like one of the first player skins for San Andreas PC (if not the first) is one which turns CJ white. The mod can be downloaded at GTA Garage, where it initially caught my attention. Recoil writes: "This mod turns CJ white. Works for all clothes and in cutscenes!" The author seems to be hidden away behind some forums that require registration, but the mod is available for everyone to download. To get it working, you need to open up player.img with IMG Tool by Spooky. All the files in the mod need to be imported into player.img and you should be set. The only question remaining is what to call CJ now. Chrissy Jarvis? Charles Jefferson?!