We made these in geometry today:
What started with cubes ended with unfolding the cubes and adding an additional crease into the mix to allow us to pull off a stellated octahedron.
Algebra went through a couple different Shikaku puzzles which can be found here.
Some students were FAST at these so I pulled up a pretty difficult one, which took a group of three around 10 minutes to solve.
I am going to take a break for the blogging till school starts up next year! I enjoyed these activities as day-before-christmas-break-oh-gosh-what-will-we-do activities to keep students thinking and engaged. Let me know what you did in the comments below!