P.S If you haven't paid The Sweet Occasion a visit already, you're nuts. Go check it out, it's the definition of DIY amazement.
Here's what you'll need to make your every own fancy shmancy customised stamp:
1 x Pen
A couple of erasers - I'm sure you've got a few floating in the top drawer of your desk at work. If not, raid the kids pencil cases.
Here goes...
Step 1: Draw the shape...