I had some black fabric paint from a previous craft that I made, so I thought it would be fun to try making a handprint t-shirt. You can find fabric paint in the craft section at Wal-Mart or any craft store like JoAnn's. This was my 1st attempt at making a handprint on a shirt, so not wanting to ruin a good shirt if I messed up, I bought a plain colored t-shirt from the dollar store.
I used a paintbrush to paint my son's hands and then pressed them on the shirt. I have also read that you can spread the paint on a paper plate and have them press their hands into it. Although I haven't tried it this way, my guess would be that it would make the handprint edges not as clean-looking. In my experience, if you get too much paint in between the fingers and on the edges, it smudges into areas that you don't really want it to go to. After the handprints dried a little, I added more things to the design. When I pressed his left hand down, I accidentally made a mark on the shirt with one of his fingers. In order to cover up my OOPS!, I drew little stars in various places. I also added his name, the date (or could be the age), and a cute phrase: Momma's Handy Little Helper. I loved the phrase since he is always helping me with the housework. :)