One of the custom orders that I had last year was for a set of three reversible toys. These are such fun toys to knit! They are from the book Itty-Bitty Toys by Susan B. Anderson. I've made a few of these as gifts. They are always received with joy and wonder as the recipient figures out that they turn inside out to reveal a second creature.
For this special order I made a lion and elephant, a frog and turtle, and a ladybug and bumblebee. The ladybug and bumblebee combo wasn't a pattern in the book. To make them I just changed the colors of some of the pieces and made some antennae and wings. There are so many other fun reversible options that I want to try.
I hope to finish some more of these soon to put in my shop. They don't seem to stay there very long though!