We do this for Easter, BUT with the right frosting you could make it look like your rabbits (I’m an art major, so mixing frosting is very fun at my house on Easter
) We make a cake shaped like a rabbit and then cover it in a pastel frosting because those are easier to make. However, if you get chocolate frosting or mix complimentary colors you can use brown frosting. I think there are black frosting tubes at our store, so you could make grey and black if needed.
You could leave them edible, or let them sit so they become hardened and more durable. You could also pipe little flowers around the rabbit once you have it placed, using your wedding colors. It would be a TON of work, but the cake we make each year looks pretty awesome
Sadly, I have no pictures with me, but you can make just about anything using cake these days. You could also look into fondont or w/e it’s called.
I also had this rabbit made of china when I was younger that would make a good center piece
I really like this idea for a wedding. Good luck!