I layer newspaper pages on the bottom then aspen shavings. the paper pages help when i clean out the cage, i pick up the corners then just drop it into the garbage. saves a ton of time. i give them a few socks and toilet paper. they love just laying on them, it's funny, they pull them around, play tug of war, they certainly don't chew them so i'm not worried. they have a huge igloo looking thing built in one corner right now, a big pile of the socks and tp. also, they dig through the shavings to find the edges of the newspaper so they can tear off pieces. watching them pull a HUGE strip of newspaper through the cage is funny, because you can barely see her, just this shaking slithering paper. my girls live in a wire cage about 3'wide 2'deep 4'tall. it has 2 big shelves, 3 smaller shelves, hammocks, tubes, perches, ladders, a bulk kraft dinner cardboard box (hutch) and a cardboard case of dr.pepper (hutch). they linked them together themselves so it's a house with a few rooms and a hall lol. i give them tp tubes that they stack inside. i also have a log thats about 4" diameter 1.5' long that i just have inside leaning up against the corner (the tp igloo is under it) so they can chew or climb it. they also have long bendy sticks and a wooden spoon. these i stick both ends into the wire caging and they just do as they wish. some they leave there to chew on (they like the option of now holding it, sometimes they run around in a fury then stop for a quick chew), and some they take out and put in their 'house'. i used leftover caging (i built their home) to make a few bridges (i bent them into fun shapes) to fill up empty space (to prevent falling far).
"If you can't change your fate, change your attitude." - Amy Tan