One of my favorite math lessons, "The Bear Problem" came from a simple math puzzle my department chair shared with us, and turned into a full class lesson with different levels for different abilities in Algebra 1 and 2.
Many of my scrapbook pages are "scraplifted" from magazines and the internet. I use my own pictures and tweak things to make it my own, but the inspiration- the light bulb, ah-ha moment- was courtesy of someone else.
This used to make me feel like I was totally un-original, but I think it just makes me a different kind of creative. I also love to share my ideas and pay it forward, if you will, so please feel free to steal any ideas you see here!