White board markers on mirrors (or mirrored plastic sheeting). There are multiple skills involved in this activity but most of all it gets you some high level engagement and that means high level attainment!
Paint Bag Writing: Add some paint to a plastic bag, seal it up & spend the afternoon with your kids drawing designs through the paint. Using a Q-tip instead of your finger to avoid tearing a hole in the bag.
Spelling Use a small chalkboard and write the classes sight words. Then use a small eraser and have the students overlap the words written in chalk. Works on their motor skills needed to write the words and practices their spelling.