My students LOVE practicing their spelling words using shaving cream. I call it "Magic Spelling Foam" to make it a little extra-special. I created this can label to perpetuate the gag. Print and attach to a 14oz can of shaving cream, purchased at a dollar store.
To practice, simply squirt a small amount on student desks. Kiddos spread it into a thin layer and write their spelling words with their fingers. Clean with a wet paper towel.