If you really want to get crazy (and if your macarons fit in a muffin tin), you could line a muffin tin with brown cupcake liners, pour some of the melted chocolate in the bottom of the liner, add a macaron, then pour more chocolate on top to cover the macaron (so it looks like a real Reese's Cup). If you do this, I would consider making the chocolate mixture half milk chocolate and half semi sweet, so it's not too sweet.