This is one we made for a birthday present for a little boy who loves craft (although I made sure there would be some leftovers for us to play with).
We got some sand from the sandpit, and sifted out anything large. We divided it into five approximately equal amounts and put it in large freezer bags. We then added food colouring and shook the bags until everything was bright. We poured them into dishes to dry. Finally we bought some cheap salt and pepper shakers and added the sand, ready for making sand pictures.