@shironeko Hmm, that of course highly depends on the size of your screen...
My little squares are 0.5cm. I assumed for my calculations an eye distance of 8cm and a eye-screen distance of 32cm. But intererestingly it seems to kinda work for different zoom factors.
@noneuclideandreamer First two look good.
For the third, the shaded base is a bit odd. The stereograms that I'm used to don't have filled regions - it's hard to track between the eyes.
I don't think the fourth works. I think the sides mean that the "trick" is revealed, and the lack of other clues breaks the 3d illusion.
@loopspace Yeah the colored bottom makes it weird.
And the perfect angle of the last doesn't work...
@noneuclideandreamer As others said, the third one is a bit troublesome. The others, pretty good.
I think the grid lines throw it off a bit. the cubes are rendered opaque but you can see the grid through them. if you drew the cubes as full wire frames, or did it on plain paper, might improve things.