Cement is cool. You mix dry cement with water, pour it or shape it or put mosaics in it and then it turns hard. Easy and quick results, my kind of crafting!
You will need: Cement, container to mix cement with water, stepping stone mold (we used a plastic tray to put a plant on), gloves, WD40 or other oil to lube the mold, credit card or something to smooth the cement surface and something to press into the cement for the decoration. I used my child's footprint as this will be a yearly tradition on his birthday until we have a whole path of stepping stones with his growing footprint. You could use all sorts of cool household things though, but coat them first with WD40 or olive oil so the cement doesn't stick.
Mix cement, and spray mold with WD40. Pour cement into mold, smooth surface with something like a spatula, credit card or spackle plastic thingy. Then press your item (foot, fork, barbie, etc) into the cement. Let cement dry for a few days then remove from the mold. Our slipped right out and was still all oily from the WD40.
Then you can paint the cement if you like or leave it as is. When you install your stepping stone in the ground, make sure you dig out an even surface for it, free of rocks. Even thick cement can crack if it is balanced on a big rock and weight is put on it.