I use the Canary build of Chrome all the time. I also use the release build when things don't go right after I report an issue.
I wanted a theme that made it very distinct which browser is which and reflected the yellow icon and color of a canary.
I wanted to upload it to the official Chrome extensions, but it is rejected on upload. That and themes and extensions are lumped together which doesn't make sense IMHO.
I hope someone else enjoys it. It works great.