One of the things that we do at this house is decorate the windows. Ever since I found Crayola Window Crayons. The kids love them, and we write on the windows for special days. Birthdays were the first, but now each grandkid gets part of a window to color. Here's Cordelia's window for Christmas.
The one thing that I believe in, is to let the kids explore with crayons, pencils, and yes, even paint! Anything goes, and they can do as much as they want.
I like color, especially bright colors, and I can see Cordelia and Molly liking that too. That's why I keep them supplied with paper and whatever.... Just to let their imaginations run free.