My entry is something that I've loved since I was a child. Art has always played a huge role in my life, and for kids, it can be really formative to their creativity and motor skills. Why there isn't any CC like this already that I can find, I don't know, but here are some pre-coloured pages (by me, in GIMP, with crayon brushes). I coloured these in the style of children of different ages to give y'all some variety. ^_^
I also recommend that you check out these crayons by Azaya, too, to add a realistic feel: http://gardenofshadows.org.uk/gardenofshadows/index.php?topic=6220.0
L-R, Top to bottom:
Fidget Spinner, Brown Dog, Sonic OC, Luigi, Minion
Cake, Princess, Weather, Minion Birthday Cake, Aisha
Neko Girl, Baby, Green Apple, Rattlesnake, Broccoli
Running Boy, Pokemon, My Little Pony
Download here! Aikea's master mesh is included.