Yeah, I give mine toilet roll tubes. I stuff hay in them and they seem to like them but the same as you really, there never seems to be any bits of the cardboard left so I don't give them that often.
I did read an idea about making a 'mini garden' for rabbits. As the weather has been so rubbish the grass is either scorched and dead or so wet that it goes all muddy and gross.
But I read that all I need to do is get a tray/litter box, fill it with soil or compost and plant grass and dandelion seeds in it.
Definitely gonna give this a go
