I would love it if the Rays adopted a green and powder blue color scheme, like Tulane, and changed their name to the Stingrays. A third nickname in two decades would be a little asinine, but the existing "Rays" nickname is all sorts of awful. The team themselves have no clue what "Rays" is supposed to refer to - a devil ray? A ray of sunshine (ironic for the only MLB team still playing in a fixed dome)? A bland abbreviation of a former name that's specifically designed to avoid offending anyone?
I didn't really like the design of the green-and-blue set they had prior to the name change (hated the scripts with the double outlines), but there was a lot of build off of there. A team using dark green with powder blue as a trim color would be very unique amongst the big four sports, and would actually give the team an identity (something they're sorely lacking right now).