The arrangement of shapes I like the best, of all the ones that came from playing with my flame shape is this one (from my sketchbook)
This is how a series is often born. One idea sparks a host of others. It's much like brainstorming. Not all the ideas make it to completion, but many of them do, often in an attempt to work out the various possibilities. It is a more natural organic way to create a series than deliberately setting out to create one. One idea flowing into another one often yields more exciting designs than sitting down and deciding, "I'm going to create three projects that are related by . . . [insert whatever here - color, shape, a particular thread].