I have one to share! I wanted to celebrate the new DIY board and thought this would be a good one.
Basically you just carve an eraser to make a stamp I used a fancy woodblock tool (they're cheap) but a kraft knift or even nail clipper would work too, and fabric paint from Michaels, etc.
I've also seen foam stickers used, making it even easier: http://madebyamandarose.blogspot.com/2014/04/stamping-with-stickers-on-knits.html
Anyone doing any kids clothes crafting??