If I got one of these cards my day would certainly be brightened. What a cheery little crew of friends! Thanks anonymous future friend for sending me a note!
Available at: Nut and Bee http://www.etsy.com/listing/60241234/mini-notes-sweet-sweet-pea ($3.50)
Every piece of paper, if these were left on my desk would say "HUNGRY".
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!
These cute little sticky notes sell for $3.50 at Nothing Elegant.