As I have a DH, 5 DS, 2 DGS, only 1 DD and 1 DGD (not a girly girl), most of the quilts I plan are either gender neutral or masculine.
The guys in my life like stripes, plaids, checks, vine/leaf prints, paisley is ok, bandana prints, flames, dragons, cars, sports, camo, and a few flowers that aren't pink can be tolerated.
They especially like greens, tans, reds, black/gray, dark blue, burgandy, any of the more intense darker colors.