There's something undeniably charming about chopping the corners off a rectangle and calling it futuristic.
Robots are appropriate for any occasion. They are neutral but friendly so you can use this card for birthdays, get well soon, congratulations on your new baby, good luck on your exams, anything!
Available at: Papire http://papire.tumblr.com/post/490921155/animal-index-markers-designs-bear-dog ($1.80)
Available at: Suck UK http://www.suck.uk.com/product.php?rangeID=154&rangeNew=1 ($16)
Every piece of paper, if these were left on my desk would say "HUNGRY".
Do you chew on your pens and mangle them? It won't look quite as odd if it looks like you're chewing on actual candy.