Nice work, Ryan!
When I saw the sticker for the first time (before the tutorial was published) I had an idea, but being too lazy and too focused on other things for the moment will not follow it: how about a little web page to create such customized stickers? Like a form to enter your text, select the sticker color, click a button and your sticker is ready!
I see two ways to do it:
- have two PNG images, one with the body of the sticker and another with the "dog ear", use a library like gd and combine these two PNGs with another one, generated on the fly, containing the text (also made with gd and php)
- work with vectors, replace the text inside the SVG and use a command line utility to convert from SVG to PNG. Unfortunately, imagemagik is not up to the task (it does not support advanced SVG features) and Inkscape is probably not available on your web host (and I don't think Inkscape will work without X)