You can modify it and I expect stuff to happen on the internet. Of course, at the same time, I was quite disappointing that I literally saw the "Voyager style nebulae" on the preview of the filter. It was too obvious. I was like, "Oh... wow." Considering the degree of modification, its not so much... it becomes a bit too easy.
Of course, I AM expecting a higher degree of modification, enough to become one's own work. Then again, it hits that wall of, "how much modification?" And it really starts becoming a thicker question of where that thin line is. I personally think the author should state where the line is but I can be wrong on that point.
Though I'm happy and VERY accepting of derivative works based on anything I make. It's just disappointing when it becomes too similar/too alike/too close to being the original.
By the way, my friends usually taunt me that I'm "too nice." They're right, I am too nice. Not that I'll ever change personalities over something I've been told about.

Whatever. My thoughts.