and wow! It actually works really well.
I had read about freezer paper all over the web, but as it's an american thing I didn't think much about it, and then I eventually got round to ordering some off Ebay and trying the method out, as in the tutorial here at MADE and it worked really well!
If anyone else wants an easy but very rewarding project to do this summer, and even involve the DCs in, I highly recommend buying some freezer paper and fabric paint and cheap plain t-shirts, the possibilities are endless!
DS's tortoise t-shirt can be seen here
You can even buy UV fabric paint on ebay 