To start us off, here are some Yum Yum Stickers made by the Korean company Morning Glory (I am not linking to the Korean website because my antivirus software found something objectionable about it...).
These are glittery puffy stickers with some very cute peppers, eggplants, and peas, as well as a carrot, some unknown yellow and orange jars (juice?), various citrus fruits, a peach (?), and a white thing I can't identify. Plus some frogs and clovers. All with upbeat greetings like "Happy Day," "Good Luck," and "I am Happy." Looking at these smiling faces, I am happy!