Never done it before, but I would try coloring fondant in a shade of tan, then making out of a real potato, the stamp, and then with a darker shade of the tan, stamping and then with two different stamps made out of the potato too, stamping black on top of the already stamped area.
I think it should work. Make sure you test it on a piece of fondant first and not the real cake.
This is something I've always wanted to know how to do, too. The only problem with the potato stamp idea - which is a very good idea for some things, by the way - is that on the leopard print cakes I've seen, every spot is a little different (I'm not sure how real leopards look - I guess I should Google a picture of one!). Would anybody who's done this like to help us out? We'd be eternally grateful!
I've not done it, but the potato trick sounds promising. You could use two potatoes and cut them in half then carve unique shapes to stamp on the fondant. Two potatoes would make 4 different shapes, and turning the stamps different directions would make a nice varied pattern.
I did a leopard print shoe once, started with tan fondant.... then painted random "spots" with darker brown. Then I went over each spot and outlined with black. Not sure if I can find a pic.... I'm not on my own computer I'll try and post if I can.
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