The Painted House wrote a great post on Tips for Painting With Children. So go there. She's done such a wonderful job writing this! I may do a follow-up documentation on art-making here at home later. TPH makes it very clear that in order for art to be part of our kids' lives there has to be a place to do it. The dining room table won't make for worry-free expression for the kids or parent.
Here are two artworks by my older son:
Here are some pictures my younger son has made a while ago:
When he was two, above.
When he was eight. He has a great sense of humor.