Sounds like a great little business that could take off.
I love Daphne's suggestion of teaching how to paint your own jeans and a nice idea for an additional stream of income down the road.

I would also suggest making some for friends and their kids and having them "advertise" for you. Give the moms your business cards so they can pass them out when others ask where she got them.

Also, to get you started, make up a few and shop them around to local boutiques. Have order forms ready to go. They will likely want wholesale pricing so price them with that in mind (wholesale is usually 50% of retail.

Sounds like a fun business! Hope it goes well for you.