So I found a few here with some very interesting sites full of them.
Do you see a fish or a girl here?

(For some reason I saw the girl 1st)
This one is totally weird (try to fix it a blink):

Another one that tends to make people puke...

To see this one, you need to close 1 eye and look at the cross... You should see a green spot appear and then the purple spots will disappear!

The last 2 were found here.
2 other sites which are full of these:
http://www.eyetricks.com/
http://www.michaelbach.de/ot/
If you want to dig a bit more, the entry on Wikipedia is also definitely worth a look: http://en.wikipedia.org/wiki/Optical_illusion
Last but not least, the most fascinating illusion of all:

If you look really carefully, you can see a waterfall at the back...
No idea how it works... Magic! :)
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