different background in M C and subcategories thumbs

[Hareth]

1. How can we create a different background and a different color for every main forum? ( I want every category in the forum with different color and different back ground. I mean main category like: news and Announcements, Community Discussions
And Community Central.

2. I want the titles of the subcategories to appear in the main page as pictures. However, every time we log in into a main category page the title appears as words not picture how can we overcome this problem?

Thank You!