In reply to timmy a:
have you put the wall/panels up yet? as it's far easier to paint them when they're laid face up.
So for the colour paint it with the textured paint as normal, then you can paint over this with what ever colour you want. The texture will come through, as they coloured layer is so thin.
as for colours looking good, if you trail through the photo section of this site, the indoor walls, you'll get an idea of what you like, what works and what doesn't
http://www.ukclimbing.com/photos/index.html?category=4