That's what makes these quilts so wonderful - they are a conglomeration of the ideas and concepts of many people, merged into a whole which communicates about a theme. You never know what you are going to get until it's all done. Here are the steps that I go through when I do so. Pick a theme. This can be anything at all - the only real requirement is that other people must be willing to contribute to the quilt.
Most quilts seem to be made up of square pieces, some are rectangular.
I see no reason why the pieces also could not be circular or oval - your own imagination is the key. Stamps, which are created in the shape and form of stamps. Pick a size for each piece. Just about any other size you can come up with Create an HTML page on your web site. This will begin as a blank page.