The Crystal Advent Calendar

Everyone loves an advent calendar, but if you're looking for something a little less Christmas-y and a little more science-y, this crystal advent calendar is a great option. They even fit together to look like a real crystal grouping.

Mr. Printables is has the instructions to make your own, and the downloadable copy to print them out. The only downside is that they are a little small, so it's kind of hard to fit some larger presents into the boxes -but they're still big enough for small candies, which is all that's in many commercial advent calendars anyway.