Oh! My apologies folks, indeed, a large chunk of them are taken from edited public domain art, usually pics from Wikimedia that have been extremely heavily edited, the ones in the more "gummy" style however were all mine.

Unfortunately, I've forgotten a significant amount of the PD sources, but I will say I wholly remember they were all PD, as I've always been very careful to work with only PD stuff in my shoop-work. How would I add a note that "A lot of these are derived from photomaniupulation-based kitbashing, but all sources are public domain"?

I will say I do remember, the four vertically-oriented ones on the lower left are from the Oz books, Jack Pumpkinhead; Tik-Tok; the Wogglebug and the Wizard respectively, some of which were colored by hand, the four next to them are all taken from old-timey sheet music covers, I remember that much. The lobster thing was kitbashed from a lobster and an Andrewsarchus, and the one below it was made from an image of a Foo Dog statue.

The one on the very lower-right was made from Robby in the Forbidden Planet poster (Which is PD thanks to a technicality), The purple multi-armed creature was kitbashed from a cover of a John Carter of Mars novel featuring one of the Green Martians, and those few below it I remember are from various old paintings of demons.

So, what do I do if I don't remember the direct sources, but do remember all the edited ones were definitely public domain (As in, using the CC0 license or having lapsed due to age or copyright screwups, I know the very specific meaning of that)