I drew this postcard for fun and thought that you might like to print and color it. The top picture is how I colored the original and you're welcome to print and send it too.
Generally I print the front and back separately and after coloring, I glue them back to back. Don't use too much glue or it will buckle and possibly bleed. Put something heavy on top while it's drying to keep it flat.
Also, if anyone prints it on a laser printer and foils the design, link a picture in the comments.