What about shifting colors, like pale blue for the start(set at something easy like 5 days) slowly darkening to navy for 30 days unbroken. Users could shift their defaults, e.g start a Seinfeld at 3 linked days, darken only at 60 days straight. That way a broken stretch can quickly be restarted with a visual cue for how established the stretch is by the shade of blue.

I really want this. Beeminder is great at enforcing minimums (which is the most important thing), but not at giving brownie points for extra work done (which not only makes it more fun and motivating to do more, but there's the issue of building up an antimotivational safety buffer, though I'm hoping retroratchet will help with that to some degree). Having an additional bonus game on top of beeminder's minimum-enforcing safety net would be amazing.

Ooh, relevant excerpt from http://blog.beeminder.com/flexbind ...

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Such is the powerful psychology of “don’t break the chain”, also known as the Seinfeld hack. But the Seinfeld hack’s greatest strength is also its fatal flaw: Once you do break the chain, all the motivation it provided bursts like a bubble. You’ve got to somehow motivate yourself to build up another long chain to not break. Until then you’re on a “one more day won’t matter” slippery slope of sloth.
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But this is a cool idea for maybe having the best of both worlds! I'll discuss with Bethany et al and also see if this gets more upvotes. Thanks so much for the idea!