#4 I like the abstractness as well as simplicity of it. if anything, the tile pattern could use some help. #3 Is too... thrown together. #2 does nothing for me.
if there is a way to incorporate #3 and #4... that may be nice.
#16 is nice... The pattern for some reason isn't working for me. I like the idea of the no-simple shape. maybe a different style pattern or maybe grunge it up.