I like what you have done, very minimalist and the colors are great. I would make the name all one color and the icon a different one. The icons need to be a little less vague and be a little more like what they are to represent. most clients will not make the leap to what you are presenting.
#72 and #76 are still not quite what I want but you are on the right path. for 72, make the image green or grey. you might try a version that is in relief like 76. the structure is still not quite right. maybe keep the inner 6 lines, but change the outer six
#76 looks too much like a feather, but I like the idea of it. an imagine as a negative.
#73 try inverting it.
#74 and #75 just too symmetrical and sparse, it ends up looking more like a lamp stand but not a tree
I like you ideas the best, but no of them are 100% what I am looking for. Do you mind work with me (after the contest is over) to refine some of your designs to get what I am looking for?