First take on the label-maker app:

You can go through the recently-sent messages (in theory), click on a message to select it, and click on the image and link that you want to use for the label.  Over on the label, you can pan and scale the image (a little weird, but interesting), and edit the label text.

(in the typical case, ideally, you shouldn't have to have to edit anything -- just go to the site and hit the "Add to Gallery" button.)