lining

I have a cage that I don’t put the grate in since one of my parakeets had deformed feetsies and the vet said it could make her be in more pain, and want to keep it grate free for my new bird, are there any suggestion for a lining material for the tray? I can’t do paper because my very first bird...

Hi guys, I would like some advice on lining for the bottom of the cage. Ive always had corncob litter in the bottom of Bucks cage and that was never an issue. I did the same with Skittles but she plays with the litter as if she thinks its pellets maybe. Im worried a bit as this is pretty solid...