Birthday Cake Lampshades Birthday Cake?

Birthday cake? - birthday cake lampshades

Ok, so I have a birthday cake with my dad tomorrow and I do not know what to do. He loves anything and everything would be what it really no problem, but a great idea. I want to make a sandwich (with 2 layers) and not a classic sponge cake, do not need recipes, I am pleased, but suggestions would be appreciated! Thank you!