Mikeasaurus, an Instructables member, has been featured on Neatorama for both his Beer Advent Calendar and his DIY Magnetic Silly Putty. It's safe to say that if you need a creative, amusing way to tell someone you miss them, an "I miss you" card created by Mikeasaurus is definitely a great idea. You can download a PDF scaled to A4 (8.5" x 11") and the template at the card's page, where you can find more cool images of the card. It's up to you whether you actually take the card to the shooting range or just poke the gunholes in with a pen.
Link via No Hope For the Human Race (NSFW)