Anyone know how to do a diamond impression pattern without an impression mat?

I did this one just using the side of a plastic ruler. I waited for the BC to crust slightly and then pushed the edge of the ruler into the icing. For a more complicated design, you could mark off the top of your cake so you'd keep them even but it wasn't hard to eyeball this one.

And what about on MMF? Do I also use a ruler? How do I measure if it's more comlicated? Between dots and points? Thanks again!

I think you could use anything with a straight edge as long as the edge isn't going to damage or cut through the MMF. You could also use the Wilton embosser...

http://www.wilton.com/store/images/site_images/1907-1206_m.jpg

To measure and mark the cake...

At the top edge of the cake, use a toothpick to lightly mark the MMF covered cake into equal spaces. Start by dividing into four, then 8, then 16 as many as you need depending on the size and shape of the cake. Just remember that the distance between marks will be the width of the diamonds. Then you'll need either a plastic triangle (like you used in geometry) or you can cut your own triangle pattern. Align the triangle as shown in the picture. Applying light-medium pressure, run the embosser or press the side of the ruler down the angled side of the triangle. Move the triangle over to the next mark and repeat. Then reverse the triangle and continue in the opposite direction to create the diamond pattern.

I never would have figured that out!! Thank you so much!! That is a very interesting way to do it. Thanks!!

Jennifer