Painting rocks is a craft-abulous group activity for all ages. I start by picking an Angel Card then write the word or just allow it to inspire my design. When I'm finished painting, I spray it with acrylic sealer. They're cute in house plants to add...
Stay inside the lines or don't! You're the boss of you!
If you don't already know Bob Ross then do yourself a favor and YouTube him asap. Try painting along w/ him or simply watch the meditation that is the MAN.
Turn your brain off but still get the mind scratching