What can I line a collectible card box with that is not felt or flocking? I made a card box, for holding Magic cards, a while ago, and I lined it with felt. While that does look good all the plastic sleeves I use get caught on the material so it is difficult to put them away. 

Flocking seems like a good idea as well but I am imagining loose bits getting into the cards and it bothers me. Yes, I have never actually flocked anything before, but even if it all adheres to the paint I find it hard to believe that it will never fleck off. 

What can I choose to line a card box with? It has to be something that will allow the sleeved cards to move freely and stay in its place. Being decorative is secondary, if it matters.
You could take inspiration from old suitcases: these used either fabric (woven linen or cotton), or paper. (I actually suspect that they used bookbinding paper/cloth, more on that later.)

Reasonably sturdy paper would be easiest to handle - patterned wrapping paper from a craft store, maybe, or even a piece of wallpaper.

Fabric can be tricky (stretching, glue seeping), but a smooth, woven upholstery fabric is a reasonable option.

If you can get your hands on book cloth, that's definitely a great choice. It's fabric lined with paper, sold in sheets or rolls. Takes glue well, doesn't stretch or wrinkle, easy to cut in straight lines. The downside is that it can be expensive or hard to find, depending on your location.