Place a rack on a bucket (or something similar) to collect the paint you spill. Then put the stones on this rack. Pour two different colors of paint in a cup. Don't stir! Then pour the paint over the stones, make sure to cover every part of them. My girls are 3 and 5 and could do this themselves. It made them really proud :-) The stones will take some time to dry, at least 24 hours.

I let my Geeklings pick the colors they wanted to use and was suprised by the combinations they chose. They worked really well, even if I didn't think they would. The result is a hand made treasure. 

After making the cardboard castle it was time to create a king and queen to live in it. I really like to use peg dolls, they can be anything and are very child friendly.

In this case I gave my Geeklings the chance to make a drawing, to show what the peg dolls should look like. This keeps children busy for a while longer ;-) You can decorate the wooden dolls with felt-tip pens, or with paint. The pens are easier to use for children.
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In this case I was the one who made the dolls, with paint and felt for the clothes. And a royal family can't do without their crowns.. I had some gold paper, but used felt as a base for stability. How do you like the result?