I made some custom maker buttons for my coworkers for our Pop-Up Makerspace event. Each one has something on it that is of personal interest to the person. You could also make a generic version by taking the medium gear stl and printing it at 75% in another color and placing it in the upper left instead of the items I have used. I hot glued the the pieces together and glued a safety pin on the back. I used oil based paint markers to paint the word maker and to paint the features on Hello Kitty.

Here are the links to the stl files I used to personalize them: Hello Kitty - https://www.thingiverse.com/thing:943523 Open book - https://www.thingiverse.com/thing:975039 Bicycle - https://www.thingiverse.com/thing:884090 Cat - https://www.thingiverse.com/thing:489281