1. It should be bright image with clear boundaries, preferably with multiple colors. Fractal images fit good, for example.
Out of it you can get a beautiful kaleidoscope – see sample1.scope folder c:\Users\Public\Documents\ArtScope\.
If you move the sliders of sectors' height, remove the background and increase the number of sectors – you will receive a mandala.
Good examples of fractals can be found on the website Flickr - , , .
This is an example of an unusual image, and it can also be an example of a quilt.
Another example of the original image and as a quilt option.