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DIY Peddle Mat. Pebble mats can be made into table runners, place mats, trivets, doormats, etc. The possibilities are endless. Step-by-step instructions. If a pebble comes loose (which will happen occasionally) just hot glue it back in place.
DIY river rock mat: River Rock, liquid nails and a cheap door mat. I did this- love this project. I've made two so far. I finished it off with a sealer to give the rocks some shine, can't remember if that was in the directions or not.
DIY Poetry Rocks and Pebbles. You can stamp them or use rub on decals. This would be another one of those gifts that kids could make or use. Tutorial for rub on decals (top photo) at The Write here. Tutorial for stamping the image here. *You can convert the pebbles and smaller rocks into magnets using really strong ones like these