I stumbled across the blog of this girl who makes amazing mixed media art, and kids shirts to die for. It's called Pitter Patter Art. I don't know anything about her, except that she is way talented. I have a ton of boring shirts for the kids that I am now inspired to make exciting! Here's an example of her awesomeness exploded onto a shirt:
She does custom orders on shirts, burp cloths, towels, you name it, as well as other pieces of artwork for you walls. M-azing!