Just a note: The measurement for the opening to use a Test Tube should be 5/8" on either side of the center fold. Picture shows 5/16". The 5/16" works for pencils though.
I bought the Test Tubes from SKS Bottle. SKS Bottle - Test Tubes # 0890-17
So I thought I would give it a School Theme twist and this is my take on her idea. The first one is for my Granddaughter. She has been playing the violin since last year.
The second one is for my Grandson. As it really is his very First Day of Kindergarten.
So give it and try and let me know what you come up with.