I came across this idea in a fab book called Tinkerlab: A Hands-On Guide For Little Inventors and it's full of experiments to help nurture creative thinking.
You need a selection of flowers, some waxed paper, some watercolour paper and a big stone (she used her wooden toy hammer).
It's pretty simple... let your little one arrange the flowers on the watercolour paper, cover with waxed paper and bash away. Peel back the waxed paper and flowers to reveal their work of art!
It probably doesn't look much to you but she was super happy with it. And I'm going to frame it. Next time we'll go rambling to find a better selection of flowers.
A great idea for Mother's Day pictures and general spring-y crafts. Spring, oh spring... hurry up!