Ah, good to know, I was just glossing over it and saw the CC0 in the info. I think for something like this, that shouldn't be much of a problem (especially for the original use-case of a Plasma splash screen) - but of course it's a bit risky, as soon as you get into more complex works, and them potentially being re-used after you publish them - where people that put it online orgininally, did so with more complex CC licenses, or no public licensing at all.

Just as a heads-up in general. I, personally, think it's better to err on the side of being creative when sharing things - but the reality is, of course, that with a bit of bad luck, licensing stuff can get quite complicated down the road. (Highly doubtful for something like this, though)