This stuff is pretty amazing. It allows you to mold and remold the block into an endless variety of textures and objects. (Well, the manufacturer says it is endless - presumably the stuff does eventually wear out. I don't know.)
To work this magic, we used a hot iron and a sheet of baking teflon (thanks Aldi!). You heat the block with the iron for about 30 seconds,using the teflon sheet to protect the iron, and then 'press' the hot block into your mold to get the image. I used printing blocks I had previously made using the craft foam (so that I got the negative image) but you can use all sorts of materials (dried lentils, pens, hessian, the list goes on and on)
These blocks are great as you can mold and remold them - the molded image will remain until you reheat the block.
Here is the first stamp I made with the original block cut from foam sheets next to it. (The leaves are black because I had used it to over print the stamped image - see the next photograph.)
I was just playing around, so this looks a bit messy, but I stamped with green first (4 times as the stamp block is quite small) and then over printed with the black ink
using the foam printing block.
This shows the stamp better ( the reverse of the original printing block). I did try to over print using pink ink. It did not work, but you can see the stamped pattern.
And then I tried the other side of the stamping block with another foam print block.
Here are the results with the stamp and the template below.
The block is a bit small (like a washing up sponge in size) but I can see real uses for it. And apparently you can get it in larger sheets which can be cut to size or used to make a larger print block.