Check out below for a video and images. I didn't do a tutorial video as I'm not sure anyone wants one but if anyone has any questions please feel free to ask.
Looks like I am trying to contact the mother ship - but this is my colour changer in action. You can't really see what's happening but that's the magic of it- at the end you get something like the below.
Look no floats in the back - a total reversible fabric!
One of my best purchase's from Ebay ever!