Make the edging look totally pro with washi tape - 36 Clever DIY Ways To Decorate Your Classroom
Corkboard Connections: Fun Countdown Timers for the Classroom. Not an app, but online timers that may be used on a Smartboard.
Such a neat idea: straw dispenser turned into a pencil dispenser, so the picky kids won't dig through all the pencils to find the "perfect" one.
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Create your own window drawing in just 5 steps! Draw on your window, glass door or actually it can be on any smooth transparent surface!