I went with a simple design based on a template at Overnight Prints. Mocked it up and it was wrapped in less than an hour.
These will have rounded corners to mimic the voice balloons, the front (the top image is technically the back, but I'm calling it the front) will be glossy and the other side not so much. The cards were about $10 and so was shipping. Crazy I know, but I think shipping is where these on-line printers make their margins.
Now to make some for What's in it for Tina?