I've been teaching my 10 year old granddaughter to sew. I told her she needed to learn hand sewing before she could use a sewing machine. Here are a few things I found when searching for ideas.
http://www.lovetosew.com/freepatternscraftsforkids.htm - string of hearts and beads; heart pillow
http://missyballance.typepad.com/cra...pillow_tu.html - four patch pillow with pocket for stuffed bunnies. Pattern for the bunny is included. Cute!
http://spoonful.com/crafts/flower-power – felt flowers. Quick and easy and can be used for many things. She made a hair clip.
Since your group of girls know how to make yo yo’s, show them what can be made with them:
http://spoonful.com/crafts/squash-softies - mini pumpkins. We made these. Adorable!
http://zakkalife.blogspot.com/2009/0...-bracelet.html - bracelet