I have shelves in my glider room and they love them. It's a great place to put toys for them to play on as well. I lined the walls of my glider room with window screen (which is easy to wipe down to clean). We built a frame from PVC pipe and then I sewed velcro to the edge of the screen and used sticky velcro on the pvc. That way, we can even take the screen down and toss it into the washing machine if wiping it down isn't enough. My guys love to climb on the window screen and the holes in the screen are big enough that their nails don't get caught. I used fleece at first, put I was doing huge loads of laundry all the time because I wanted to make sure that the fleece stayed clean. The screen is much easier to take care of. The PVP pipe is fastened to the wall with hooks and small bungie cords. This leaves only small holes in the walls so they will be easy to fix if I ever need to.
The PVC pipe is also a great place to fasten fleece vines to for them to climb back and forth close to the ceiling and to hang down do they can get up and down that way.
I bought two mesh toy towers that hang from the ceiling (from Ikea). I hung one straight down from the ceiling and the other I hung on it's side up high across one end of the room. I cut holes between the chambers in the tower do they could crawl between the chambers. In each chamber I put different things. I have feathers, balls, little pieces of fleece, army men and other small plastic toys, toilet paper tubes, straws, anything that they like to play with that's small. I hang various toys inside the chambers as well (like the monkeys from the barrel of monkeys). I think my guys almost like those toy towers more than anything else because they can climb on them and in them and they keep finding new things all the time. Sometimes I even hide treats in some of the chambers.
On one of my shelves I have a free standing Fast Track wheel, so they can go on the wheel outside the cage if they want to. I also have pieces of PVC pipe that are big enough for them to get inside of. I fastened several pieces of this PVC pipe together (on it's side so it looks kind of like a honeycomb) and they love to climb on that and sit in the pipes looking out.
I have several different children's toys - a shape house, a Winnie the Pooh tree house, a dragon looking thing that has lots of holes in it for them to climb through, etc. I put these on the shelves and swap them out regularly.
I also have a couple of ferret tunnels that I hang on and between the walls for them to crawl through. This gets kind of yucky after a few days, so I only put one up at a time and swap them out so I can have one up when I'm cleaning and drying the other one (it always takes a couple of days for it to dry completely). The worst part of the tunnels is that sometimes they go inside them and go to sleep and it can be hard to get them out to get them back in the cage when I'm ready to leave the room. I don't leave them loose in the room when I can't be in there.
I'm sure other people can give you even more ideas for what to do with your glider room. The main thing I have learned is that I need to change things out really often so they don't get bored.
Plus I also still use the tent regularly so they have a change of scenery. I sometimes use the tent to let them have a cricket hunt. I just turn the crickets loose in the tent with the gliders and watch the fun.