I used to used pellets that are made of recycled paper but they kept foraging through them and sometimes eating them. I got a custom cage liner from Jana. I love it!
http://stankusr.wixsite.com/gr8potsjss Those are awesome products!!!! I personally, the easiest for me in my position, is keeping the tray bare. But those liners are great! I use them for the uptop playground on the roof of their cage. I actually use a drop pan from a previous cage up there and it works well. The reason I don't use on under their floor is because I do not have easy access to shake it out every morning, and I won't leave that food left under there all day to attract bugs. They are only on their uptop playground at the most 3 times a week, and that's even if they want to come out and go up, so it doesn't get too soiled and there's no food left behind, so it can wait till I have more time.
I do have custom shelf liners from her that are amazing too, and I know of another person that use liners in their gliders drop pans, and hoses them down instead of throwing them in the wash. They can also be hand washed/lined dried or lay flat to dry between laundry. Very versatile to work with, I'd definitely use them if I had time to get them outside to shake down every morning before work. I just go so accustomed to my routine with bare tray cleaning, it would take a extra time in my situation using them.