I received the magnets in the mail today and it came out exactly how the proof had appeared online! BuildASign lets you either upload your own custom design or use one of their templates; I decided to use one of their templates but customize it. Take a look!
BuildASign also has a sister site, EasyCanvasPrints.com, where you can create custom canvases based on your own photos or photos/paintings/etc. that you like.
I would definitely use BuildASign again if I needed magnets or signs for my site, or if I wanted to make a bumper sticker. If you see me at BlogHer next week, ask me for one of my magnets! If I have extras after the conference, and you see me in line for a local movie screening, feel free to ask as well.
Thanks again to BuildASign.com for providing me with some sponsorship for BlogHer '12!