I am doing a wedding cake next month that is supposed to have little dots spaced out in a diamond pattern on two of the tiers

like this one : http://www.cakecentral.com/cake-photo_1452028.html

Is there a stencil or template that I can use to get the dots evenly spaced? I can make my own stencil I guess, but I'd like something sturdier than paper or cardboard.

The tiers are going to be square. Thanks!

okay, so I answered my own question... I finally found what I was looking for. I just wasn't entering the right keywords for my search.

I found an impression mat for it.
http://www.cakesbysam.com/store/cart.php?target=product&product_id=21526&category_id=263