When some time ago I was working on source mimetypes for Oxygen, I also had to do the ruby source mimetype, also known as mimetypes/application-x-ruby. Before starting the icon I knew it would have had a rubin in it, then I went to the official Ruby programming language website and realized they already had a very cool logo. So I did some research and found out there was Ruby Visual Identity Team providing a media-kit with the logo graphics in many formats, included our beloved SVG
The media-kit is distributed under a Creative Commons license so I get to the mailing list and asked if they could do an exception for Oxygen mimetype icon. Yukihiro “matz” Matsumoto in person gave me permission to do so and as a mutual favor I sent the Oxygen’s ruby mimetype to the Visual Identity Team which is probably going to include the icon in their media-kit. I really enjoyed this collaboration, it’s a nice way to promote two very cool open source projects. Later, I approached in a similar way the Python guys which have been as nice as the Ruby ones. I love those developers. Cheers.