Is their anychance you could have a custom font settin in the control panel so that you have a font you have made by choosing,style,font,size and coulour in the forums???
Yeah, you can have a skin chooser on the bottom as a dropdown menu in both Invision Power Board and vBulletin. I've saw that on many other forums, but its more work for David to design and do templating for the skins to make them all work properly with the ads and the features of the forum and stuff, but that wouldn't involve any of the post colors or fonts or anything.