My little girl and I did these way back in the spring one day. She gets quite bored and lonely with her big brothers in school all day and loves to paint and stencil like Mommy.
So we picked out some smooth rocks - which is not a problem in the rocky Michigan ground I live on - and we cleaned them up with soap, water, and an old toothbrush.
I love all the different stencils you get in these packs at good ole' Wal Mart:
I had some black DIY chalkboard paint already mixed up so we used that. I figured it'd be more durable than regular ole' paint and I think I was right.
(In case you're wondering, it's 1 Tablespoon of Plaster of Paris stirred into a cup of latex paint).
It was an extremely windy day, okay?! :)
The trick with kids is to control the amount of paint on the stencil brush!!!! A tiny, tiny bit goes a long, long way! It dries in a minute, so a second coat is not a long wait for impatient little ones.
Then they all get a coat of polyurethane with a foam brush (since you'll probably want to throw it out when you're done), and that's all!