Gullible fool I am. I tried this:
http://www.wikihow.com/Lighten-Your-Hair-With-Cinnamon
http://www.ehow.com/how_2146927_lighten-hair-cinnamon.html

Didn't work. Left it in for over the 8 recommended hours. It was really hard and annoying to get it all out, and it was everywhere afterwards. It took a while for me to clean the bathroom.
I honestly see no difference in my hair color whatsoever- possibly a very (I mean VERY) slight reddish-brown tint in some places and some reddish hair follicles, but barely enough to notice unless you're an inch away from my hair and in bright sunlight. No pics needed. The camera wouldn't capture any difference.
Final word: not only do I never want to smell cinnamon again, I'm pretty much never gonna try any other "natural lightening". Maybe I should stop being a pussy and go get some bleach. Or atleast make a salon appointment.
One more thing: my hair seems kind of frizzy now. Although my hair tends to randomly get frizzy so I don't know if that's from the cinnamon or not.

That is the weirdest thing I've ever heard!
Maybe it does work, for some people anyways.
My sister has dark blonde/light brown hair and when she used that Sun-In spray her hair turned very pale blonde.
For me however, it did almost nothing.
Oh well, at least no harm was done to your hair right?

I'd say the frizziness is probably from rubbing the cinnamon through your hair. I'd imagine it could be a bit abrasive but it's probably nothing a conditioning treatment won't cure.

At least you gave it a go. Some people say lemon juice and sitting out in the sun works but I think that's really only for people whose hair lightens in the sun anyway. I know mine doesn't.

Somewhere I heard that Sun-In has bleach in it anyway... not sure if that's true though.
Also, apparently some mixture with honey is proven to dramatically lighten hair, but it can be as damaging as bleach since it forms a natural peroxide or something like that.