Here's some examples of hanging cabinets directly from the wall without feet.
"Went through this recently. Decided to wall mount above the block foundation.
Makes for a nice clean install with no need to worry about how to fill the gap.
Top block is 61/2" from floor. Puts the top cabinets a bit high up to reach things that might be in the back of the top shelf. I'm close to 6' tall and can manage fine with that. I suppose if your shorter you might need to keep a step stool handy."
Stole this from the "Installing wall lockers and cabinets" thread. Thanks road_king.
But wait there's more!

"I'd second this method of installation. Set mine up on the "curb" around the outside of the garage about 6" above the floor. It makes sweeping under them much easier and I have a nice place to store snowmobile lift, dollies, etc. The bench is not real clean in this picture, but I have been very happy with the NewAge cabinets!" says Mr dglennon
I'm pretty sure both of these guys got their cabinets from me, well maybe.
