Students would write their words in white crayon then they could choose a colored marker and color over their word and see it magically appear. I think this would be fun for the younger grades because they would enjoy seeing the word magically appear.
Giving students a list of words and telling them to memorize it for a test is not super effective. This spelling activity would encourage students to make relationship to the words, while reinforcing some vocabulary as well.
Say It, Make It, Write It Mats - How to Use Them Six Different Ways