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Hey, I just wanted to throw something out.
I don't have a template but they are not hard to make since its just the same image folded in half.
Years ago I made some card packs. I found I got amazing results though by cutting tiny pieces of cardboard (probably chopped up the back of a notebook) and folding two sides of a pack images around it and gluing it shut.
It gives a slight thickness and really feels like a tiny card pack.