Edit: yup, it's made of AI images
This is not an AI-generated pic, it's a photo taken with a real camera. The logos, however, are hexagons divided into 24 triangles each, and these triangles contain often thematically related (e. g. lions for Brave) photos or photorealistic AI images (the info I found online does not state either way) cropped to best correspond to what the triangle would contain if it just had the original logo. Basically, that corner of the whale surrounded by white was taken from a face photo (or AI pic).
The second "S" in "FOSS" is "software". You did not publish software, just its output: bitmap assets needed to print the stickers. Thanks for CC-licensing your creative work but source would mean showing what's under the hood. We don't know how you sourced the images used in each triangular tile: generated to best correspond with AI? Matching pieces from Wikimedia Commons photos?
Edit: Look closely at Arch for example. It's clearly just the logo placed in a hexagon, approximated by a mosaic of 24 triangles with AI images of differing quality. Is that snow or whipped cream? How can PCB traces be as blurry as watercolor and go nowhere? At least they're topical: for Arch the prompt was probably "mountain OR architecture OR arch OR technology".
Presumably, the process for each tile is this:
To consider this open source, I'd expect you to at least post the scripts you used in steps 3 and 5. To consider this good open source, it should contain a guide detailing this process, best with examples. I'd expect the AI part will be "bring your own model" but you could tell which one you used and its settings.
The idea is creative and "human" enough for me not to condemn it. "FOSS" or not though, you should disclose use of AI, especially since you're selling the printed stickers.