These look great, especially entry #4 and #5. I really like the mark creations and the subtle gradient from dark blue to light blue. I just feel like the helix in entry #4 seems a little off - but I do really like the whimsical aspect of the circle. I'm not sure if it's outside lines being a little thick and/or if there needs to be some sort of depth (shadow, color change, or something) to actually show that 3D dimensions of a helix. It just seems a little flat.
Also, entry #8, #9,#10, #11, #12, #13, and #14 are too cartoonish for us. Entry #15 is nice, but the color need to be more along the lines of entry #4 and #5.
Thank you very much for your hard work, looking forward to seeing the next version.
Thank you!