I'm always on the lookout for fun art projects for BOYS. This is what we did after our city's "Touch a Truck" event:
Yup. That's an ink pad. And lots of different toy trucks and cars. When you drive them through ink and then drive them around on the paper they make fun tire patterns! Each car and truck has it's own tire tread pattern to watch for too :)
It's fun to explore what happens when making curving vs. straight lines with the trucks. Beware, if you offer multiple colors of ink, eventually they all look like brown muddy tracks...
But little boys (and girls) LOVE it!