meganmo27, you're cake turned out AWESOME! Your leaves look like heat treated copper. Beautiful!
I, too, made a cake Sunday after reading this thread. I'm a newbie so the cake I made doesn't compare, but I was happy with it and of course my non-caking co-workers were amazed. I colored gumpaste in yellow, red-orange, and red. I used a storebought cutter for the small oak leaf, but the other two were hand cut from templates I made.
Although I thinned the edges with a ball tool, I will try to roll them thinner next time. I veined them and manipulated them and then dried them on a cookie sheet that I had layered with crumpled foil. When they were dry enough to handle I dry brushed them with gold and bronze lustre dusts. The dusts lessened the intensity of the colors, so they didn't appear as richly colored as I would have liked them to.
meganmo27, if you would like to share how you colored your leaves, I would like to try your technique for a Thanksgiving cake. If not, I understand.