Would you mind putting a proper license on this? The Free Software Foundation has a good explanation of why “informal licenses” are bad. (TL;DR: In some countries, the law might interpret a not-precise-enough license statement as invalid and, thus, “All Rights Reserved”.)
(If you want to see how far that “other jursidictions” thing goes, take a look at this analysis of how far the CC0 has to go to achieve “like Public Domain” status in Germany’s “protect the creator from giving away too much” system.
(eg. Germany’s legal system prevents you from giving away rights that didn’t exist at the time you made your statement, so the CC0 includes a clause where you make a legally binding promise not to sue over rights that get written into law later.)
Once you’ve got a license on it, it’ll probably wind up in my Libre Game Assets list and I’m willing to do that for any asset set you put up under a suitable license.