You might try something around the house that you can use. Or you could also make a stencil and use that. Other than that the only thing I could think of is a butter knife and a ruler to do it by hand. Some of the things that you might have like my George Forman grill has these plates that come out which could be used. Also, a slotted spatula or spoon might be able to accomplish it. But I definetly would play around first before you do the actual cake. If none of those work, a trip to Michaels and a rubber stamp could do the trick!!
My local Michael's is now selling Duff's cake decorating tools. He has a brick patterned impression mat and one with a line pattern for about $5. They come two to a pack. Yes, without the impression mat, i'd also suggest the ruler/knife and do it by hand.
Actually Michaels has one made by Duff its a two pack its brick and wood grain in one pack for $5.99 then if you use your 40% off coupon even cheaper haha
I also found a few really neat foam type mats....but, they work for impression mats in the area where they have train supplies.
You know the phony trees etc for railroad displays.....Mine had some neat mats for making these displays. Stone etc. and they were really cheap
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