Here is one idea I've used before with an ocean/beach theme that you could tweek...it is more for class motivation and recognition rather than a behavior cueing system but thought I'd share...my kids loved it
"X" Marks the Spot
X marks the spot.
Hidden treasures untold.
Maybe even gold?
The ancient map
provides the clues
For good little sailors
If they choose.
I had the poem displayed and we would read it each morning as a reminder about choices. When I caught a student making good choices he or she would get a puzzle part of a map. When they collected all the parts they got to go to the treasure box as a reward.
I've also used it for the entire class on a bulletin board. When the entire class was caught making good choices or showing a specific character trait or received a compliment I would put large parts of a map puzzle on the bulletin board. When the class earned all the parts of the map puzzle we had a class reward usually in the form of a secret treasure like watermelon, popsicles etc...at the playground.
I've also used treasure incentive charts with jewel stickers for earning a treasure from the teacher and had many different rewards like free computer time, sit with a buddy, pencil, etc.. in a treasure box for them to select. I wrote the rewards on gold coins which made it a lot of fun.
Anyway don't know that this would be anything you are thinking about but thought I'd share.