ive heard of using kitchen role, and i like the idea, but y not put it thought a shredder (we we get small trips). i mean its cheap, easy to clean, and it allows for digging 
i personally cannot see problems with it
but i thought i should ask on here as you will probably know best.
and would it also be ok for a leopard gecko
i personally cannot see problems with it
and would it also be ok for a leopard gecko