I wouldn't be against the idea of finding your own image to use but that's up for discussion
i think that's very generous of you, jt. however, and it's an however that's up for discussion too, it's my feeling that you chose these images because there's something in each of them that spoke to you. that would be the first point. secondly, i think this month's challenge is open enough, genre-wise, without everyone being able to choose their own inspiration. i believe there need to be at least departure points in common, those departure points being the images you've provided.
just my thoughts on the matter