if you dont have the mat or want to roll balls of fondant you can take various round objects and press the open end into icing over a piece of plastic wrap. irregular round shapes would be best, perhaps getting a few old tips and squishing them out of shape would work.
I think the mat would be the easist. I just ordered a little brick mat off of ebay. It was a buy it now for under $5, including shipping. Goodluck!!
P.S. There are different sizes of them as well. I got the smaller one.. that's all I needed. I know that www.shopcountrykitchen.com sells the bigger impression mats for $11 + shipping.
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