I could see already that this thread will show the "creative side" of every man in this forum
Ideas:
Looking at your garage, the epoxy paint on the floor looks really good but not really sure about putting a lot of checkered flag paint on it, probably just a stripe right in the center and paint top and bottom that kinda blend into each other...top has lighter color and bottom will be a little darker so in case it got dirty, it won't be really noticeable...and don't put too many picture frame on it!
or, get one of your favorite poster or painting and use that as a guideline for your paint but not too much coz' you want that painting to be the central focus of the garage...