I have some colored bingo chips that I bought at Staples in the teacher supply section. This paper keyboard is large enough for those chips. Print it on card stock, cut it out, laminate it, and tape it together. Then you can spend some off-bench time with your student learning the names of keys, steps and skips, and intervals. Children need to get away from the piano some, especially children with different learning styles. Children who learn kinetically do a lot better if they can place a manipulative on a keyboard and move it around.
If you don’t have any bingo chips, cut out some colored paper into circles that will fit this keyboard.
This graphic can also be used by young children to write the names of the keys. If you do this, you can print it with economy mode of your printer on inexpensive paper or even the back of paper you’re discarding. I never throw away a piece of paper if I’ve only used one side!
[Edited: This file has been remade with a smaller keyboard the same size as piano keys.]