Get an old yoga block and carve it up. We used a bread knife to do this. For each stamp you want to make you need to cut a block of about 1 inch thickness and a block of about 1/4 inch thickness, both to the height/width you want for your design.
Draw a design on the thinner piece. We used a sharpie but it came off on our fingers a bit.
Cut the shapes out. We tried using a craft knife but found it easier just to use the kitchen scissors.
Stick the shapes on to their blocks (we used copydex as its waterproof so we can wash paint/ink off the stamps), and leave to dry overnight.
Stamp away! We loaded up our stamps by rolling a thin layer of paint onto foil then stamping into this.
Have fun crafting x