I call them my apothecary jars, mostly because it sounds cool and "apothecary" is more marketable than "chemistry." I washed them with bleach and ran them through the dishwasher to make sure there were no chemicals or anything else left in the jars when I wanted to fill them.
In these jars (from left to right), I put cinnamon candy, whole allspice and curry powder. I also have one on my desk with my paper clips in it. I'm not sure what I will do with the others right now, but they would be great for gifts, candies, spices, oils, and pretty much anything else. I know I'm a nerd because I'm so excited about these jars...but look at them! They are so great! ;-P