Everyone loves Portals!
It's a shame that you couldn't engrave something that would be obviously an orange underneath the Apple logo.Just for comparisons, obviously...
That's silly - everyone knows that you can't compare apples to oranges.
"Don't Panic" in large, friendly letters?
I ♥ BT
Group photo from the AAISPI$$UP?
+1 for "Don't Panic!" on top of the Apple logo, followed by perhaps a Marvin quote: "With the brain the size of a small planet ...." maybe?
A Windows logo!
How about an Ork from LOTR or the eye of Sauron?