Just recently I made a donation to the Electronic Frontier Foundation, an organization that protects your rights in the digital world. During the donation process, they offered to send me a t-shirt. I declined, which gives them my entire donation, but I still wanted to have the t-shirt. Since their site is licensed under a Creative Commons license, I proposed to them that they offer the t-shirt under the same license — which would allow me to print it out myself and share it for non-commercial purposes.
To my surprise and delight, they responded almost immediately and put up the .EPS files for the t-shirt, which can be used directly at nearly any print shop. I plan on printing up one of these, and if more people want one we can maybe get a small discount. I really appreciate it when large organizations respond with speed and enthusiasm to mutually-beneficial ideas like this.