One of my favorite craft shops are reopened with a new name and website: Seven Hills Crafts
and they have a Color Challenge on their blog.
I have used the "Happy Mail" stamp set from Wplus9, prismacolors for coloring and made the background with Distress ink. Lawn Fawn Small Stitched Rectangle Lawn Cuts and My Favorite Things Stiched Circles for the frame.
Have a great day!