I am also victim to a one car garage at the moment. I have 3 frames and a few wheelsets in the attic and then the garage:

This wall holds 6 fully built bikes and hangs two frames above it:



This is the left of my workbench, holds one frame and then two wagons converted to display shelves - one holds my vintage saddles and the other some of my cars..



Opposite the 6 full built hanging bikes is this 2x4 storage rack for large plastic bins. The rack holds one bike horizontal in the middle and one bike vertical at the end. I am overstocked so the Bottecchia leans in place where it is in this photo for now. The 2nd from the bottom row of bins is all bike parts - one bin for handlebars, one for saddles and brakes, one for complete grouppos (the Kona group is in there along with the start of another SRAM Rival group) and the last bin for misc. The other bins are x-mas, halloween and other less important house stuff...



Here is a pic of most of the stable posing in front of the garage door: