I've been frustrated by the cluster that is the closet behind the bedroom TV. It's a big space but with no shelves and AV boxes everywhere, a lot of that space is wasted.
I really don't have the skills that a lot of people have so building my own shelves was out of the question, not to mention I really don't want to add weight with wood. In searching for lightweight, plastic shelving, I realized that it is impossible to find a single shelf that would work. I did, however, find a shelving unit at Menard's for only about $20 and the dimensions were almost perfect!
This lifts all of my AV equipment far off the floor of the closet, but still with enough room to operate.
Heck, I would have paid way more than $20 for someone to build me a shelf. Plus, I've still got three shelves left to use somewhere else!
EDIT: This is the unit I purchased if you want to see the specs.