I've had this stamp set awhile, but I finally inked it up with my Hero Arts Hybrid Inks and loved how it turned out. I cut the circle myself with one of the infinity dies from Hero Arts, but you can purchase pre-cut cards too. The stamp set is Sweet Treat from Jillibean Soup, and technically, it doesn't have to be a shaker card, but there's no open circle for the open part of the machine, so you'd have to draw it in.
You could make your own shaker part too, if you don't like the deep acrylic shaker that matches the stamp set, but I do because I could fit in the gumballs embellishments from My Favorite Things. You could also add a ton of sequins, beads, and stamped gumballs you trim out too.
I've seen it made with cake sprinkles and that's pretty fun.
Here's a close-up of the gumballs. I also used my markers to color in the machine at the bottom, it's striped normally. You get gumballs and jimmies stamps and some sentiments too. I love how quick and easy it was. I know more of these cards are on the way!