#19 is a nice alternative design. lowercase I in #7 & #11 are creative, but too jaunty for me. #7 might be interesting with only two blue loops, with the inner one rotated CCW until it just contacts the outer one (kind of a Wankel engine motif)
#52 is headed in the wrong direction just because of the gradients in conjunction with absence of any IT/IS/Aviation idea it's trying to communicate (at least that I am picking up on). You are actually closer with #38