I just dressed up my bathroom with various-sized bubbles from bubble dingbat (dafont.com). The best thing about this was that I was able to cut these bubbles using SCAL from the same sheet that I used to cut dinosaurs to decorate my son's room. So, I decorated two rooms using only 2 of 12 X 24 white vinyl sheets. Bubbles were so easy to put on the wall as it didn't require any precision measurements - I just tried to put the smaller bubbles more on top.
A simple bubble, but it just added so much to my plain bathroom.