Very lovely cards! I thought to add these as an option in a game I'm making, but the aspect ratio of my cards is a bit different. I thought perhaps I could tweak your cards, but the numbers aren't available as separate images which makes it a bit tricky. A great addition would be separate numbers, if still available.
If it's too much trouble don't worry about it, I'll find another way to make it work.
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If that's something you have time for I'd happily use them, but don't worry about it if not!
It's very much a "nice to have" for my game. It's a simple classic solitaire game with a few faces to choose from buried in the settings. The others are utilitarian or classic. I quite like yours to add some variety and charm, but I can always add them a later date! There's little rush and it may even be a fun addition to arrive later.