heres some i found on this site
http://www.2dorks.com/gallery/2007/1011-illusions/index.shtml ...
1. the first central circle then appears smaller than the second central circle.
2. This optical illusion makes the parallel straight horizontal lines appear to be bent
3. In the above example, the red seems lighter combined with the white, and darker combined with the black.
4. The illusion plays on the human eye’s interpretation of two-dimensional pictures as three-dimensional objects.
5. In this illustration, the two figures are identical, although the lower one appears to be larger.
6. In the image above, a white equilateral triangle is perceived, but in fact none is drawn.
7. When one stares at the cross for about 20 seconds or so, one first sees a gap running around the circle of lilac disks, then a green disk running around the circle of lilac disks, then a green disk running around on the grey background, the lilac disks appearing to have disappeared or to have been erased by the green disk.
8. One type of motion illusion is a type of optical illusion in which a static image appears to be moving
9. Note, that although the gray rectangles are all of equal luminance, the ones seen in the context with the dark stripes appear brighter than the ones seen in the context with the bright stripes
10.In this figure the black lines seem to be unparallel, but in reality they are parallel
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