Yes I'm always changing cage furnishings.
I love putting stairs in my cages.
I hang large tubes instead of hammocks, even cut windows in them.
If they like a blanket, save all your old fleeces and cut them up, use them and throw them out.
I run out of old fleeces and sometimes have too buy a meter with every new litter. I launder each cage fleeces and when the kits start trowing them around the cage I throw them out.
Ramps and slides are fun, staggered small shelves up one side of the cage.
Guess a lot depends on the size and shape or your cages.
Oh balls of rope or string are fun. Or tie big knots in a good fiber rope and hang them up.
Plain old cardboard boxes a blast, all sizes and shapes, cut door and windows, the only thing is they don't last long.
But that's the fun it it changing it around.
I try not to block up their cages, just give them things to play with.