I've heard to get a quilting effect you jut make lines across the cake, but then wouldnt the squares look flat? How do you make them stand out and almost have a "puffed up" look? Any suggestions are greatly appreciated!

I've done it a few different ways, but I found the quilting effect to be the "puffiest" when I used a diamond impression mat on a thicker layer of MMF. Then I went over the lines to give deep impressions with an embosser tool. HTH!

Here is a beautiful deep quilt effect cake from laventure, with instructions in the comments.

http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1574790