I have one of
THESE for my truck, but it works well in the garage as well.
The materials cost me $40 at Lowes. It took me about 90 minutes and a couple beers in the garage to fab up.
The website claims the sun will damage it in a couple years, but mine is running strong after sitting in the bed of my truck for four years straight.
And for the record, most of my bikes hang from the ceiling.