Have you Filled a Bucket Today board with ways people fill & empty buckets, a bucket with notes, and an envelope "mailbox" for each kid to receive notes when they have been a bucket-filler (sent by classmates).
The Teachaholic: whiteboards! This is a cheap and quick way to make them yourself. Just buy a pack of plastic sleeves and insert card stock (paper makes it too flimsy when they display their answer). Voila! I use a ring clip to store them. EASY! You can even print lines or graph paper on the card stock if you find it useful.