C.I. ~ Collaborative Postcard

This is the old favorite.
If you are just starting: Take a coloring postcard, divide it into 4 sections. Color 1 section. Put your own name and address on the back so it can be mailed back to you when it's done. Then, pop it into an envelope and mail it to your partner.

If you are a return rider, When you receive a card, color one section, the put it in an envelope and mail it to your partner.

When the card is full, drop it in the mailbox and mail it home. (No envelope).