Hi Lane,
I have gelled EO's with great success. Lavendar, Ylang Ylang, Tea Tree, Lemongrass, Patchouli, Peppermint, Basil, Rosemary, Sage, Rose Geranium and Anise are the only ones I have tried so far and they all held up wonderfully for me! I have read about the citruses fading though...