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Adafruit DIY Snow Globe Kit [ADA3722]
Not merely a snow globe, but a show globe! This custom container is durable, clear and round, with a large flat screw-on top and a press-fit rubber stopper. The stopper makes a nice seal, and is also hollow which means you can put (you guessed it...) electronics inside! This makes it perfect for your own electronic-powered snow globe.
The stopper inner diameter is ~60mm diameter and ~13.5mm deep, which means it has tons of room for goodies. We picked this size because it fits a Circuit Playground Express or Circuit Playground Classic with a 500 mAh lipo battery perfectly. Or if soldering isn't scary, maybe a 16 NeoPixel Ring with your favorite small microcontroller board. You could also go simple and just toss some wire lights in there. Or, since it's so easy to disassemble, try all three!
You'll need water, glitter or some other snow-like materials, glycerine (to slow the water down), something cool to show off inside, and E6000 glue to make the stopper seal permanent. Those items are not included, but you can purchase them at your friendly local art supply, crafting or hardware store.