I happened upon these today while browsing the Home Depot: Closet Max 11-1/4 in. Heavy Duty White Shelf and Rod Bracket-RP-0495-WT at The Home Depot

It turns out that little Us on the end that are for supporting a clothes hanger rod are actually perfect for holding an old bike up, while still allowing a shelf to be put on top! Anyone have any other tips/tricks to save space with their collections?