Hello, I am wondering if someone would be able to tell me what size board to put this 
cupcake bouquet on?
yes probably -- and a method for you be able to tell for yourself is to lay out cupcake wrappers and eyeball the rest 
but you also might want to use two boards so it doesn't flex -- or use thicker foam core board -- just depends on the weight of the cupcakes
Would you happen to know what is the board covered with?
no I don’t know but it could be freezer wrapping paper or parchment —gift wrapping paper is not food safe neither is florist foil so a lot of us do use it but extra caution has to taken that the food is protected from it — so just using food safe paper is easier/better —
I always imagine someone not even involved with the party coming in afterwards to pick up a party goer or a banquet worker — they’re maybe carrying their baby in to wait a minute and maybe they sit down momentarily to wait while their loved one gets their things and gives the baby a swipe of icing from the border of the cake plate — it ALL needs to be healthy for everyone — know what I mean —
so be careful
I've also used wrapping paper, covered with plastic wrap and plastic table clothes, which I didn't like. Most commonly, I cover my board with fondant. Freezer paper sounds like a good idea too.
It looks to me like butchers paper too. I bought contact paper.
I looked it up and this brand is made by Duck and it is food safe. The brand Con-tact is not though.
Sorry I am in able to show a picture of the finished work because the customer came to pick up her cupcakes early and I didn't get a picture.
Your contact paper is pretty and I am sure it made a beautiful board.
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