Hey! :) I really like the composition of 28, it seems as though I could walk into that shot :) with a nice sense of Foreground, mid ground and background too :)
38* sorry, whoops!
Definitely 34 and 36 for me, absolutely love your camera angle on 36! However I also like 35 and 39 because they're a nice, completely different take on design, but 34 and 36 feel that much more 'lair'-like than the corridor-based 35 and 39 yet you could combine the shapes used in these thumbnails with the egg shapes of other thumbnails - the eggs could be in the floor with 35's shapes in the walls for example :)