Good idea! Here are a couple of things we like to make...
Hot Dog Octopus
Cut the hot dog in half lengthwise, leaving the top part together
Rotate the hot dog and cut it again, still leaving the top part whole
You'll have a hot dog that's normal on one end and cut into 4 long quarters on the other end.
Boil the hot dog and the 4 quarters will curl up to form "legs" and it will look like an octopus.
Cheese toast shapes
Place a piece of cheese on a slice of bread and toast.
Cut another slice of bread with a cookie cutter shape.
Top the cheese toast with the crusted part of the bread.
You'll have a hole in the middle of the sandwich that shows the cheese in the shape that you cut out.
You can serve the cut out piece with some cinnamon or top it with another piece of cheese.