The glass effect on pictorial for #10 #11 #12 should be more pronounced (see http://i40.tinypic.com/124hlhz.jpg) for examples of what I mean. I feel that as is now it does not look quite right.
The gradient on the type should be straight horizontal rather than curvy like now, it might make the wording easier to read at smaller sizes that way.
You should probably invert the color split on type for #10 and #11 so that shuffle has the lighter color and path the darker one.
Can you try using a darker green in the type for #12 (let's try r:66 g:110 b: 107 and readjust from there)
I was going to suggest the more asymetric arrow bottom part (margins in respect to background), great catch there as it balances that part much better that way.
I like what you've done on #15 to #20 , I'm not sure about the way the type is looking with these gradient. One thing we might want to try is go back to a solid two color type idea like you had on the early examples while leaving the pictorials like they are now.