I realize the viral licensing of those seven (7) texture files may be awkward for some people. It isn’t because the files are special or precious, nor have I put great effort into them. Here’s the story: when I created SkyControl, it was GPL’d. In December 2013, I was talked into changing the license to BSD (see Seeking alpha testers for SkyControl - #6 by abies ) a decision I occasionally regret . I’ve stuck with BSD licensing for code, but for new non-procedural assets I prefer CC-BY-SA.
I include my name and e-mail in every source file for a reason: so users can contact me if they need to. If a developer seeks a less restrictive license and they play nice, they won’t be “pushed away”.