Christmas Elving: supplies

I teach science. You wouldn't believe the things I find in my back storage room at school. 

 Recently, I found dozens of old beakers in the back room. 

DOZENS AND DOZENS.  

And we're already well overstocked at school, so I thought, "Why not use them to make Christmas presents?!"  So that's what I did!  

Here's the beginning stages of the whole endeavor.  Like all handmade, DIY ideas, it took way longer than I expected, a little more money than I planned on, but turned out beautifully...which I will show y'all after I've delivered them all.

Can you guess what I made???