Sticky notes are useful. Not just for quick memos and reminders, they also happen to be square. A square is perfect for origami. One thing to watch out for is the sticky part, it can make origami a little difficult. When I’m deep in thought, pondering an algorithm or something, I origami like to do origami with sticky notes.
I like to write love notes to my girlfriend on them as well. Fold them into airplanes and turn the cubical farm into an airport. Sometimes it’s good to make the ordinary extraordinary.