I read this book in 2003 but I have no idea what the publishing year is.

I’m pretty sure Leonardo da Vinci’s Vitruvian Man is on the cover. It’s science fiction. It’s in the future and all races have cross-bred so much that people all have brown hair, skin, and eyes. People go into the virtual world to change their appearance so they can be different...cat tails, blue skin etc.... that’s all I remember.