obvious: round cake that looks like a target with one or more arrows sticking out of it.
--- and then there could also be ----:
3D cake that looks like an apple with an arrow through it.
3D cake that looks like a person's head with an apple perched atop with an arrow through it (unless you want to do a morbid bit of humor and oops the arrow missed)
same as above -- but goofy miss -- they're shooting arrows that have the rubber suction tips on them and by golly got miss molly right in the forehead!
cupid doing target practice?
takeoff on cartoons where some gets their rear end all shot full of arrows (could even make this a joke on person thinking they were going to get a "shot" dr medicine style but oops they were used for target practice instead.