What's A Good Piece For Three Violas And A Cello?

I love playing the viola in my high school orchestra, and unfortunately two of the other three people who are trying to make a quartet with me also play viola (the other one plays the cello). We were hoping to overcome the fact that we don't have a violin, and call ourselves "The Viola Project". But pieces for three violas and a cello are very rare, and I was hoping somebody out there on Yahoo Answers would have some suggestions. Any kinds of pieces are open, so long as they AREN'T in Treble clef. Thank you so much!