What can you put on a cake board to keep from getting grease marks (look at bunny cake on my page) so that when you cut the cake its not tangling with foil? 
Look at this video, it might help you.... For sure u can make it square or customized shape. And as Edna said reg. cardboard is usually covered in foil (aluminum or the special colored ones from bake supplies). I even once used the kitchen adhesive for drawers, it looked pretty too.
I buy WAXED cake boards from our cake supply store. If the cake is on a board I'm getting back, I cover a Masonite board (also from the cake store in various shapes) with white contact paper. The contact paper cleans up well and when it does need replacing (after knife marks digs, etc after numerous uses) then I just cover it over with more contact paper.
I hope that helps!
what video? thanks everyone....I will have to try something.
No you are not, and I think the politically correct term is airhead? LOL Just kidding.....thank you soooooo much!!!! 
I sit my cake on parchement paper, with the shiney side up on the cake. I cut it to the size of the cake. sometimes wax paper if Im out of parc. paper, and one time in my spider man cake I extended the icing all over the board, know you cant do it with most cakes especially elegant cakes.
and in medic terms...we dont say retarded ...we call those call and pyscho. calls "1096"'s...lol since my kids arent alowed to use words like hate, stupid, idiot, retarded...as they can hurt people...they go around saying 1096. lol They are now in there late 20's and 30's.
I use parchment paper cut to the shape of the cake. I find it is better for cutting on too.
When I've used foil to line the bottom of a cake, I've had it get stuck to the cake when lifting the cake off the board because it can tear when you push a cake lifter between the foil & the cake. Wax doesn't work so well for me either because I find it can break down from the grease too and has a tendency to tear. I find parchment to hold up the best.
My personal preference...HTH. 
I thought 1096 meant you had to go number 1 or 2 hahahahaha 10-4
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