So I went to Creative Commons and did a search, and found this little beauty:
While I was there, I also saw this fascinating work and thought I would share it here:
By the way, as I have said elsewhere, all of my text here (at least anything that is my original work) can be considered under a similar licence. The only additional condition I have added is the need to "share-alike". That is, any derivative work needs to be licenced under the same licence. If you care!