Thank you all for your help with this project. Found the fabric paint sticks at Michaels. Great suggestions and advice. Thanks to sewsalot and janquiltz for the freezer paper idea. I cut out the freezer paper inserts and just put them in over my cardboard inserts. This is great because it stabilizes the knit fabric while you try to draw your design. I have a feeling that my 2 granddaughters (9 and 10 years old) and my great granddaughter (7 years old and older sister to the new baby) will be the ones that will want to design these shirts. It should be a fun project. I will try to post some of the photos of the children with their special onesie designs. Thank you all for your kind and important tips. Yolanda Wood River