I never refrigerate my fondant cakes- it dries them out anyway. I keep them in the freezer if I have a perishable filling or I need to keep them longer than a few days (which is usually the case). If I need the cake within a few days, I leave it in a box (or plastic container) on the counter to keep the dust out.
But you can put the fondant decorated cake in a cakebox and wrap in 2 garbage bags (pushing out as much as as possible) or in a large tupperware container. When you take it out, it will be wet (tacky to the touch) so just let it dry off for a few hours. Then you can do any painting or RI decorations (these do not freeze well). I do this all the time and have kept decorated cakes for a couple of months. They taste totally fresh- problem solved!
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