"Permission to change the colors of the chosen appearance.
My suggestion is that the user can get access to changing the colors of the characters on their page. I would like to be able to change the colors, as many of the pre-defined colors don't satisfy all the users."
Acho que dá pra fazer isso mas tem que comprar créditos de CSS e também saber bastante sobre o CSS em geral. Tem um foro aqui para falantes de português, melhor perguntar lá.
I think you can, but you gotta buy credits and know enough about CSS. There's a Portuguese-language forum here, better if you ask there.