So these are my unexpected smash hit of an idea, Caffiends!
They're just little monsters based on drinks (despite the name, it doesn't have to be caffeinated-- it can be anything, alcoholic or soda or coffee or juice, even fancy water drinks if you fancy!); I sell customs (you tell me the drink you want and any design elements you really want, and I go wild), which comes with a design and a chibi, for $10! (Without the chibi, just a design is $7).

The first was my original, my Monster monster (bottommost left), but when I made Coke and Pepsis to sell (the top two-- Pepsi's buyer didn't buy a chibi, so he doesn't have one) as adoptables, they kind of... took off.
A lot more than I expected.

Monster original and Sunkist belong to me; everyone else was either a custom or has already sold. I hope to do more premades in the near future!