For a vareity of clear logo options my preference is #33 and#34.
This looks good in color and black and white. Would easily reproduce on collaterals, t-shirts, banners, etc
I like just the color filled and not try to also add a graphic, although that could be a future option.
My only recommendation would be to fill with other colors such as yellow, purple, aqua and orange (the blue, red, yellow and green layout looks similar to a curved version of the Microsoft Windows).