I squeezed a little blue and yellow paint into a zip lock baggie and sealed it shut. I would suggest using the freezer bag kind simply because it's thicker and less likely to tear as little fingers drag across the bag.
Then I taped the bag to the table.
I showed Beansie how to smush the paint all around the bag to mix the colors.
This is a great sensory and fine motor activity for little hands and fingers.
Busy wanted to show him how to do it so I made her one, too.
Then he got either really excited about painting or really perturbed that the paint wouldn't come out of the baggie. Either way, it was fun! :)