Here's an example

Look at this page: http://houstonlively.com/m/chat/home/

Notice how the colors of the chat skin blend in with the site, as if I actually planned it that way.

Then switch to the uni template, and see what you think. I'll tell you what I think. It's a damn eyesore. The dark chat room may as well be surrounded by fluorescent light bulbs. I wouldn't be able to look at it for 5 minutes without getting a headache. The entire website has to match, or else it looks like you see more just slopped it all together. Dark websites that use the default flash skins look awful. You're browsing around, then decide to go to the chat page, then BAMM!! .... it's like somebody shining a search light in your eyes.