Doug of College Station, Texas (Go Aggies!) turned a 1976 Honda GL 1000 into this café racer decorated with the color scheme and cutie mark of Rainbow Dash. The racing number 11 is the same one that Rainbow Dash wore during the race in the episode "Fall Weather Friends."
Doug hasn't completed a Sonic Rainboom yet, but he's considering building a sidecar decorated with the colors of Scootaloo, a young pegasus who looks up to Rainbow Dash.
At the link, you can watch a video interview with the builder.