This isn't a new idea - but my kiddos love this. Especially when it is presented as a game! I program it with different sight words each week. We do LSCWC twice a week - and just to switch it up a little, we use crayons, highlighters or markers to write the words. They like covering it and seeing if they can remember what the word should look like!
I saw something like this on a blog awhile ago - so if it is yours, please let me know so I can give credit!