That should work just fine. Although, cans of frosting are usually too soft to pipe cleanly and they take a while to harden up once you've applied them. I would probably add a bit of confectioner's sugar to make it stiff enough to control. Whatever you do, I'm sure you'll be fine. Just have fun with it!
We started with a bag with a hole in it and decided to just use a small butter knife and frost the whole cookie - we are frosting freaks here. We made gingerbread men, trees, stars and circles - they are delicious!