More about the scintillating grid effect can be found on Michael Bach's fascinating website about optical illusions.

M. Schrauf, B. Lingelbach, E.R. Wist, "The Scintillating Grid Illusion", Vision Research 37 (8), 1033-1037, 1997
 

The two segments in the Wundt/Jastrow illusion are of the same size.

Kinetic depth effect: motion creates a three-dimensional illusion.

In the Münsterberg illusion the (straight) line appears to be tilted down towards the left side.
 

The two circles in this picture evoke a VERY strong illusion of clockwise/counterclockwise rotation. But they are absolutely static!!.

This illusion depends critically on the brightness of the background. If the contrast between red and cyan is reduced by making the cyan background darker it doesn't work any more (at least for me).
 

In this illusion by Ehrenstein (1941) the area where the lines would cross appears to be brighter -- but it's just as white as the rest of the background.
 

If this image is moved (e.g. if you scroll this page in your browser window up and down) the inner sqare seems to move left/right with respect to the outer sqare.
 

In the Ponzo illusion the two lines appear to be of different length.
 

What appears in this illusion found by Fraser in 1908 like a spiral are in fact concentric rings. Follow the "spiral" and you'll see that you end up at your starting point.

J. Fraser (1908) "A New Visual Illusion of Direction", Brit J Psych 2:307-320
 

Have a look at this fascinating illusion by clicking on the image above.