My idea is that Shaun loves cakes and surprises so decided to get in the cake but showed up a bit earlier and almost ruined the cake. The base is the field where characters usually play. I made it from modeling clay. It could be easily made as a real cake. Number 1 could be attached to Shaun's hand with a stick or could look like is thrown on the field. I used my daughter's Shaun toy for better presentation and I think that would be good to have the other characters figures around (like they are waiting for the anniversary cake).