I found a few frames with an art deco feel and decided to make a few illustrations to fit. The process on these was pretty simple: colored pencil outlines on watercolor paper, and the rest filled in with watercolors.
These reminded me of something you might find in a beach cottage, so I just went for the first thing that came to mind: turn-of-the-century bathers. I worked from the memory of Halloween costumes so the suits may not be entirely authentic. Cute though!