If you don't want to make them yourself and you're willing to google and google (and google and google and google and google?) - you might have some luck by figuring out useful google hints to remove the wheat from the chaff.
You could check out Ebay and Redbubble and if you find stuff you almost like - you can grab the images (or do a screengrab) and then post again here or in a few reddit subs to get suggestions.
It's hard/impossible to make suggestions without better images as a starting point.
If you don't want to make them yourself and you're willing to google and google (and google and google and google and google?) - you might have some luck by figuring out useful google hints to remove the wheat from the chaff.
Maybe a googling starting point is?...
Stickers - Marxist Books
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Ninja edit
You could check out Ebay and Redbubble and if you find stuff you almost like - you can grab the images (or do a screengrab) and then post again here or in a few reddit subs to get suggestions.
It's hard/impossible to make suggestions without better images as a starting point.