I used this product or a similar one years ago, and did a heart in watercolour style it worked great, just watched this little video to see if it looked the same & yes it is. One quilt show we went to the quilter hadn't placed her squares close enough together so when she folded & stitched some of the raw edges weren't caught in, just something to remember.
http://www.youtube.com/watch?v=aU4w6IekRgg
Just went through my quilt photos and for some reason there's not one there of it, sorry.