I've seen them a few different ways. You can either buy them on sugarcraft.com or you could make them out of fondant or gumpaste, use a leaf veiner and paint them with petal dust or if you have a air brush you could use that. Or you can also take a real leaf and "paint" melted chocolates onto it. (make sure the real leaf if clean)
Mel
Hi I made some fall leaves by tinting MMF different fall colors. Then I took small amounts from each color I wanted and kind of mixed it together-not so much that it all turns the same color-but enough so that you can't tell where one color starts and the other ends, then rolled it out as thin as I could and used a leaf cookie cutter to cut them out and drew the veins on with the back of a knife.
I also put crumpled up paper in a 9x13, and layed the leafs on it to dry. That way they dry crinkled up and not flat and perfect.
Hope I helped you. I am the one who did it and I think I actually confused myself. Hope you understand!!
I posted how I make my leaves here... http://www.cakecentral.com/cake-decorating-ftopict-9593.html
HTH
I made some out of fondant and gumpaste. They were very easy and marked veins with a toothpick and let dry on a cookie sheet covered with crumbled up foil and wax paper on top so they didn't stick. The person I made the cake for wanted green ones too, but I prefer the more fall-like colors.
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