They will still chew up sheets and carpet though, and it seems like carpet or puppy pads would be worse for them to eat than fleece, isn't it?
Nylon/polyester/acrylic bedsheets are made of long interwoven plastics-based strands which makes them very durable and hole resistant, especially compared to fleece which is just enmeshed fibres that can be easily pulled apart by a chewy bunny. But you're right it would not hold up for long against a particularly determined bunny.
As for carpet, I meant those tightly-looped, practically solid ground types, similar to what you get in the backs of vans/MPVs. Those would be much harder to pull up and chew than a typical loose-looped plush house carpet.
Disposable puppy pads are of course easy to destroy, but I've found that my bunnies, who have demolished 2 pet beds, 1 throw, 1 fleece, and 1 blanket tunnel, just don't seem to have any interest in chewing on them. Maybe it's too thin, maybe the plastic sheet sides don't taste very good...but it's the one thing I've put in the cage that doesn't have teeth marks all over it!
Textured linoleum as mentioned above would also work very well, provided you don't mind the constant soft clacking of bunny nails. (My hubby did
)
Either way, these are just suggestions I'm throwing out, it's what works for you that matters. Good luck!