OK, I'm just learning how to do these comments... All of your entries are really good. Entry #11 - this is the one that I commented on before - love what you've done with the Y, but I'd like a little more color. I like the heavy font too. Entry #18 - love what you've done with the Y on this one too, and I like the colors. #13 and #15 are nice, but I like the other two better.
I really like your work - still liking the format of #53 best. It's simple and clean. I like #52 as well, just like the look of it, but the implied body of #53 seems to be a good match.