As a maker/hacker/tinkerer or whatever you call yourself, when you’re dealing with electronics projects, the focus is generally on getting it to work. Many times this is good enough, and you perhaps move on to something else, but if you actually want people to accept your device as useful in real life, a good cover is an excellent way to make things look “finished.”
I first noticed Wgb’s store via this micro breadboard enclosure. It’s a clever little device, sized for a 170-pin breadboard, with holes cut to fit a Spark Core microcontroller. The enclosures are priced at only $2.00, though shipping will run more than twice that price. On the other hand, Wgb lists the files needed to make it on Thingiverse, so you can print your own if you prefer.
If you check out the rest of this store, a few other electronics holders and enclosures are listed, as well as a few other “Tindie-appropriate” projects. The dead battery flip jar looks like fun, and it is set up so it can use “dead” double-A or triple-A batteries that are no longer producing useful voltage for your other electronics.