filtering - Multi-select filter other than check boxes?

I have 5 segments to choose from when browsing galleries. I want users to be able to browse more than one segment at a time.

The obvious choice is to have a filter under the nav with 5 check boxes.

What other UI options exist? Check boxes are ugly. I've tried a list in the sidebar and bolding the segments that are active but I don't find it to be apparent enough.