I was wondering am going to try frozen buttercream images and I was wondering if you could do them a day or two before you put them on cake because am going to make a cake staurday and wanted to make them today and I was wondering well they be ok?
I am also doing a FBCT for a cake on Sunday. I had plan to do mine probably tomorrow night. But tonight would be fine.
I try an always make mine a day ahead that way there good and frozen and peel off the wax paper real good and saves a lot of time
The ones that I've done have been done 2 days before decorating and have been totally fine. Just a word of caution, make sure that you do your transfers on something straight that doesn't bend. The first one I did was on a very thin plastic cutting board and when I stuck it in the freezer it kind of bent when I put it on my cake the side were touching the cake but the middle was off the cake, like I could look through to the other side. I was able to hide it, but the next time I made one I put it on a non-bendable sheet pan.
I've used a cookie sheet before if I had several small ones that would fit on it, but normally I use a cutting board or plexiglass or whatever is handy. 
I have different sizes of plexiglass to correspond with the size fbct that I am doing.
Good luck 
I actually did 13 FBCT total for the pokemon cake I did for my son's bday (12 on the sides and one for the entire top of the cake). I started them several days in advance since I do have four kids running around creating chaos in their wake, so my time decorating is limited to the evening hours most of the time. You should be fine doing them in advance. Just leave them in the freezer until you are ready to put them all on the cake.
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