This activity is fun and creative for the kids but also great for hand eye co-ordination as they use their hands to balance the tray and get the marbles to roll through the blobs of paint.
You will need:
Marbles - any size
Place paper into oven tray, try to choose paper size as close to tray size as possible. I cut an A4 sheet to fit.
Pop your marbles in and off you go, roll away from side to side, top to bottom.
Make patterns and roll the marbles through as many blobs of paint as you can.