This is my default. I've got it because I am a rabid Robin/Chopper shipper, and this image is just about the distillation of how adorable the pairing is.
This is one of my favorite moments in Avatar. Seeing Toph wave her hand in front of her blind, unseeing eyes still gives me the giggles. I use it, insofar as I HAVE a system, for when I am about to say mean, cutting things.
If you've watched One Piece at ALL, you don't need me to explain why I have this icon.
This one is crudely made, but the text and the image together form a perfect composite of hilarity.
This is...well, it's the offspring of Robin and Chopper. Unlike his twin sister, Ropperine, there has not been any consensus in the icychat about a name for the little guy. Someone wanted to call him Chobin or something like that, but I personally call him Dasher. In any case, I have this icon because of the aforementioned shipping and OH GOD ADORABLE.