This is a great site! This picture in particular has two great things: crates (that are on wheels!) and dry erase dots on the table. Great way to let kids show and do their work. Maybe even put them on students' desks? What a great idea!
DIY crate seats - these may be way better than the couple of rickety old chairs in my room I usually have students use at my desk... Using a picnic table cloth for easy cleaning coverage and adding casters to the bottom.