Created a set of stamps recently, based on the idea of creating your own Mario themed coloring page. So a few building blocks, a few characters. I did forget to reverse the design when cut, so the actual stamp would come out the way it was planned, but mostly this doesn’t matter.
They work pretty well, certainly well enough for my kids, who aren’t too critical.
First time trying to create stamps, so learned a bit on that. I used silicone based rubber, per my research this doesn’t have the dangerous fumes of some rubber material.