Here is a great resource for your clay vocabulary needs for elementary and middle school. It is hand-drawn for that sketchbook feel and can be distributed as handouts or printed large on a poster maker - your school probably has one!
Clay Pencil Holders - The ones I am using now are turtles. I left the bottoms open so the kids do not fill them full of broken crayons and stub pencils. - Glad to hear that happens everywhere ... not just in my class!