This is a repost (the Retina bit is new), but for those who haven't seen it before, you can share particular initial seeds by clicking on the "Permalink" button.

An example Retina seed: http://jashkenas.s3.amazonaws.com/misc/deJong/deJong.html#52...

Annotated source here: http://jashkenas.s3.amazonaws.com/misc/deJong/docs/deJong.ht...

One interesting question will be if anyone finds a single seed that works well for both regular and Retina versions.