I am currently having a dark styled theme custom made for our new Xenforo forum, so all that leaves is a light theme which I will let you the members choose (Since I won't really be using it.) So don't worry about the price and please choose what you like here:
Oh God, everything looks so XenForo-ish... I don't know, I'll use the default theme anyways... But one of the light ones that caught my attention from that list was: https://xenforo.com/community/resources/elegance.2420/