Lucas loved these activities - and so did I because I could control the amount of paint used (and mess made!).
I got the cardboard lids from Woolworths. Just ask at the service desk if you can have a couple and you'll get them for free. I put butches paper in the bottom of each lid and then a few squirts of our favourite paints.
Straw Painting - Make sure the paint is heavily watered down for this one. Blow air through the straw and watch the paint spray across the paper.
Car Painting - Lucas loved this activity! Seeing the tracks in the paint and then making new tracks was the highlight.
Marble Painting - This was also a favourite. Be sure not to let the kids go wild on this one, otherwise you will have marbles flying everywhere!