Yes, I have some in the freezer now. What I do is squeeze the leftovers into plastic ziplocs and flatten them out and seal. Then I thaw them in the fridge the day I want to use and I sort of use them as a "starter". They don't seem to separate once frozen, but I never seem to have enough for another project. I add more "thick base" to correct any consistency issues. It seems "thinner" out of the freezer. Jaci at Ali's Sweet Tooth is, I think, the one who got me saving my icing in the freezer. I had been tossing quite a bit! I almost always start with a fresh batch of the really thick stuff and add the thawed to it. I have not ever frozen the thick base stuff...I rarely have that left over. Admittedly, I don't always save...sometimes I'm tired and I toss.