I stumbled across the blog "Make It and Love It" (thanks to Sallie I believe) and she had a tutorial for Wee Wee Wigwams (her own Pee-Pee Teepees). I needs them!
[Right now we just use half a wipe, which only lessens the damage during accidents.]
Step one: Cut circles of 2 types of fabric. Then cut in half.
Step two: Sew the two pieces with right sides together, then turn right side out.
Step three: Top stitch near the edge.
Step four: Fold in half & sew the rough edges together.
ta-da! Wee Wee Wigwam. Simple as that.
Oh, and I held Seth the entire time I made it. hooray!