Does anybody know how to add the option to select multiple skins from the user cp? i would like to add more than one skin to my board and give users the option to choose which one they like
If you're talking about your own forum all you need to do is to add styles to your board. It'll be somewhere in the admin panel area where you do all your work. Add the styles and it'll be available for any member to choose in their profile
If you mean on an invisionfree board, you need a mod. http://support.invisionfree.com/index.php?showtopic=147649 On any normal IPB, it gives you the ability in the ACP to add multiple skins, and users can change it from their controls (in IPB 1.3) or from the bottom of the board (2.x and up)
