My Wordlin.gs site was an experiment to see if a merchandise-supported model would work for creative visualizations. It has had some usage, but I've yet to see a single purchase of a t-shirt, mug or poster, so I'll be shutting it down next week to save the $250 per-month Heroku costs (largely due to the database and image-processing requirements). I'll be contacting users who have put up public images so they can save them. I'm sad it didn't work out, I'd love to focus on pure visualizations thanks to a solid revenue model, but I learned a lot.