Admittedly, my recommendation works significantly less well in this scenario. @nauthur’s varient on it could work, or the de Morgan do-less equivalent. (i.e a do-less of "days which end with laundry that is done-but-unfolded.)
If you have some broadly defined but amorphous project you want to work on, you can Beemind it this way—each day you record if you worked on the project at all that day. (Another way of doing it would be time spent on the project, but I often prefer to avoid the overhead of timetracking.)
The classic Beeminder goal of “go to the gym” is perhaps an even better example. You track going to the gym, not doing any particular exercise there, meaning that Beeminder gets you to go to the gym without locking you into any particular workout (which may vary from day to day in any case.) This is particularly valuable given that when you don’t really feel like working out Beeminder still gets you off the couch and to the gym with the promise of “it doesn’t matter how much of a workout you do when you get there, but you do need to go.” (And when you do get there, you’ll usually find yourself doing far more of a workout that you could have motivated yourself to get up and do when sitting on the couch at home.)
But as I said, this can extend to just about anything. I’ve got a Beeminder goal called backups; in which I beemind interacting with my computer backups.
What do I mean by “interacting with my computer backups”? Well, it could be one of several things. Looking over my automated tarsnap backups to make sure they’re running; making a new (manual) local backup (to an external drive); testing restoring from backup (from tarsnap or a local external drive); or rotating my local backups (I keep one external drive with backups near me, and one in an offsite location, and every once in a while I switch which is which.)
It’s valuable to be interacting with your backups on a regular basis, because the absolute worst time to discover some sort of failure is when you need to recover from backup. The precise details don’t really matter—so long as I’m in the habit of doing one or more of these every few weeks or so, I can be confident in my backups strategy.