Mason jar air freshener - fill a small mason jar about 1/4 full with baking soda, and add 6-8 drops of your favorite essential oil. Punch holes in the lid, and place in any spot that could use some freshening. Every once in a while, give the jar a gentle shake to boost it's air freshening power. Could even paint the jar lid!
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Natural gnat killer. I used a mason jar and rolled up a piece of paper like a funnel. Keep the bottom of the paper right above the top of the liquid. It will trap the gnats in the jar and they will drop into the liquid. Works awesome!