Monster Postcard, ideas for back

Monsterpcbackideas

I've been sketching different ideas for the reverse of my Monster Tea Party postcard. This is an oversize postcard, with 1-color printing on the reverse. When you print postcards that you design yourself you need to follow a very specific template. The odd shaped box on the bottom right of each card represents area that must be kept white (or less than 7% gray). The squiggly lines on the left (and top) stand for my contact information and other copy. I'm stuck deciding between #5 and #7. I like the idea of bringing a character into a second 'scene' but the sign he's holding seems weird and out of place. The flowers seem pretty and innocuous but maybe too safe and easy. I'll have to keep sketching and see what comes of it...