Dear Future Self, Remember when you used to dream about being rich? You had a board called When I Win the Lottery. Well, look at you now. Broke as hell with over things on your board. I guess you're rich in pins.
For a holiday party: Fill balloons with water colored with food coloring. Set them out when it's below freezing. After they've frozen solid, remove the balloons and you'll have something resembling giant marbles.
DIY slushy: Shake up soda while it's still sealed and put it in the freezer for 3 hours and 15 minutes. Loosen the cap to let some pressure escape and turn it upside down. Works with any carbonated soda.