A few months ago in July 2017, I was at the local(as in, an hour-and-a-half drive away) Lego Store and saw that they had a ton of Mixel joint ball-and-socket pieces. Over the course of an hour or two, I made this rainbow-colored robot on the spot, purely using pieces from the Pick-a-Brick wall.
Not particularly based off of anything, just meant to see if I could make a highly articulated robot of some sort with the limited Pick-a-Brick selection. This was a fun challenge, and impressed the Lego Store employees. I decided to leave this MOC there for others to see, but not without taking pictures. I hope that this can inspire others too!