You can make many different kind of clothespins, for example with a mini chalkboard, magnetized ones, or simple ones.
You can buy the pre made chalkboard paint or do it yourself following all the instruction of this instructables:
Step 1: WHAT YOU NEED
-Flat piece of scrap wood;
-Flat piece of magnet.
Step 3: PAINT THE PIECES
Allowed it to dry and remove the tape.
If you did the paint yourself follow all the instruction of "http://www.instructables.com/id/Make-Your-Own-Chalkboard-Paint/"