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)
Sushi is good lookin' but you can't exactly keep it sitting on your desk as decoration. Now you can have the looks with no smell AND it will help your productivity!
He doesn't really look like he wants you to have a nice day, but the sentiment is there.
Available at: Nut and Bee http://www.etsy.com/listing/60241234/mini-notes-sweet-sweet-pea ($3.50)
Available at: Rakuten http://en.item.rakuten.com/wich/kittyscope/ ($21.36)