No slip barrette help

[shanin.livejournal.com]

I have been making my daughter some barrettes like these...

and this one is my first very rough looking attempt using the tutorial I found here. My question is my daughter keeps losing them and I want to make them stay in her hair better using something to make them no slip.  I have googled no slip barrette tutorials but so far I haven't found anything and I was hoping the crafty ladies (and men!) would have some ideas to help me out. 

Thanks!