We worked with the hemmer feet this month.  Once you get comfortable with where to place your fingers and how to hold the fabric as it feeds through, a good looking hem is possible.  I played with a couple different stitches with the cotton weight fabric (floral) and with the narrow hem on the batiste fabric (pale green), created a small scallop.
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| April's Foot Book - Hemmers | 
I got a bit of puckering on the scalloped hem because I was using too heavy a thread for the fabric.  I've been using Sulky's Blendables 30 wt cotton for most of the pages.  Should have used a fine thread...but it was at home and I wasn't! haha
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| Mini book with pictures of the feet. | 
Bernina has lots of these hemmer feet.  I have only 2 - the 66 and 69.
Keep on Stitchin'!!