I like #38, #37 and #54 the best. I really like the box design you have come up with, its simple, clean and easily recognizable. I like the font color in #37 and #38 better than that in #54. Could you try changing the colors in # 37 and #54. Try using colors that are still bold, but look less toy like. I really like the color scheme that Starbucks is using for their new VIA Ready Brew.
Here is a link showing the colors in their new VIA packaging. Try using some of these bold, yet earthy colors in your design.
I think that your raw box design is the best of all the entries and has great potential. But for this design to win I would need to see something more. Try changing the color scheme radically. Right now I find all of the entries where a single box is multicolored a bit too much.Try limiting the number of colors used per box, consider removing the circle around the box and replacing it with some other element a bit softer.