I usually decide on a build and then bag all the parts except the resistors (which I have loads of). I use freezer bags with the zip lock, and write the name of the effect on the front. If, after building and testing it, I determine it's not worth boxing, then I'll recover the socketed components and place the carcass in the bag, and store it along with other not-so-good builds.
So far I only have a handful of builds which didn't work out, and some I'm still experimenting with. That could be the subject of another thread...