Review (5/5): Loved this product. (Yes, it's just a stippling brush, but better than DIY.)
I can't rave enough about this product. I've had it for a couple months now, and I've used it with mostly eyeshadow, but all sorts of colors. It's removed them all pretty much instantly! I will say that the only problem with this is that it will probably make people forget that even though it's taking off the pigment, it's not removing bacteria and such, so you should probably still wash your brushes once or twice a month.
And yes. I know that it's just a stippling brush in a little can. So if you want to DIY it, I'm sure you could. I find this a lot more convenient than trying to spend an afternoon coming up with a copy of this. Part of its use is the can: the stippling part doesn't move around (well, it rotates a little) because it's contained in the can. So I just have it sitting in a corner of my makeup box, and I can just brush my brushes towards the inside corner, and it doesn't move. Alternatively, you could put some hot glue or silicone on the top face of the lid, so when you put the lid on the bottom (like the picture) and had it on your countertop, it wouldn't slide, either.
Anyways, love this product! Also works with bigger brushes. I'm wishing I'd bought the duo, though, because it's supposed to work with creme make up.