Sand Mousse - sand, water and a generous amount of bubble bath - great for pre-writing skills large circles, patterns, etc using fingers and hands, with pattern making tools or small world - don't remix it with everyday sand - it goes a bit smelly! We transferred ours out to our 'Mud Kitchen'
Quicksand! 3 cups of sand, 2 boxes of cornflour, paint and a small amount of water. It moulds when you move it and begins to 'run away' from you when you hold it still. We particularly enjoyed paddling in it!