Abusing LCD Cleartype Techniques

The above is more a proof-of-concept than anything else at the moment, but an interesting trick to show one thing on most LCD's, and another entirely (a flat shade of grey) on most CRT's I've tested the image on.

Start with a 1-pixel checkerboard of pure green and purple, this is your 'universal background' to start with.
Add a layer of pure white, set to 'Difference', with an Alpha channel. This grayscale alpha channel is where you put your frames of animation of what-have-you one by one, flatten the image, save a frame, undo a couple times, lather, rinse, repeat. Note you want actual grayscale images, not sharp black-and-white ones, otherwise you just end up with green-and-purple blotches everywhere.

Edit: And as a side-note, an easy way to make visually understandable images is to draw your image elsewhere, then decompose it into CMYK, and duplicate the resulting K channel into the above-mentioned alpha channel.