I get a monthly kit, and I try to use as many of the embellishments as possible from each kit. Usually there are die cut packs and epoxy shapes, which I like. Right now I'm using quite a few rhinestones; Walmart has packs for $1 each; each pack has 3 sizes, and they come in several colors.
I definitely go in spurts. My all time favorite has always been brads. But now Foundation Décor came out with the cutest wood buttons so I use them a lot lately. Also epoxy dots in different colors. I use a lot of wooden emphemera lately too as well as matching emphermera to the cardstock paper lines