I am making a cake for a surprise party for my son's friend who I do not think has ever had a big to-do for his birthday and I want to make his cake really special. Anyhow, I made the cake and I crumb coated it in white and stuck it in the freezer. Today, I am going to decorate it and the icing is not white. How should I proceed? Should the cake and icing be frozen when I go over it so that I don't get streaks? I did not even think to do it in the color of the cake until after the fact. I hope I am making sense and that someone can give me advice. I know he won't care if it's not perfect but I really want to make him a nice cake. Thanks in advance!

you can just ice right over that -- if it's already a thick crumb coat then just thin it out a touch then proceed

I do this often.  Make sure the crumb coat is thin & that it's firmed up before adding the top coat.  You should be fine.

Thank you so much! I really want to do a nice job and I was worried.