This clip holder for picks is very ingenious.
It has two separate parts which hold two picks each. It even comes with picks, although I don't use them - I use thiner ones and they fit well in it.
I've only used a piece with two picks - more than enough for rehearsals and live, but if I feel that a gig is going to be more energetic, well just add the other part and voilà 4 picks ready to use on the mic stand
Cheap and it does its job.