I'm happy I haz you.
Available at: MimosaCards http://www.etsy.com/listing/57201344/cheeseburger-cat-im-happy-i-haz-you-set ($12 for a set of 10)
He doesn't really look like he wants you to have a nice day, but the sentiment is there.
When you turn your monthly report in to the big boss, don't you think it would be better appreciated with a little whimsy thrown in?
These cute little sticky notes sell for $3.50 at Nothing Elegant.