Do you know the children's book "The Rainbow Fish"? It was a huge hit some years ago (well- actually a lot of years ago). The kids like the glittery scales of the fish. We made our own rainbow fishes the other day.
If we would have had a bit more time (and I would have been without Yotam on my arms), we could have started with making a nice background with water colours. But as it was we started with drawing fishes, colouring them, adding some glue and glitter. The girls loved it (the glitter part, of course), the fished looked very nice and the kitchen table and floor were full of glitter :o)