ooh ooh I know, you can try using the foam-y shelf liner. I've used that numerous times to make bumpy impressions in fondant. I think it would be perfect!
Edited to add that there were a couple of posts regarding the use of Contact Paper in cake decorating and the potential dangers. Since this product (even though different) is sold in the same section and for the same use (shelf liner) you may want to check to see if it's food safe. I would before using it again after reading those enlightening threads. Now I'm going to keep my mouth shut! 
i used a kitchen towel for a similar kind of look, just pressed in into the fondant one it was on the cake.
xx
I just did a small basketball in fondant. I used a mesh strainer to press into the ball to get the grainy texture.
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