My headliner was the eyesore of the interior. The interior was perfect except for the headliner. It looked like someone let a cat loose in it. The material on the original headliner wore out so bad that just running your finger across it would make it rip. Here is what it looked like before I replaced it. And, here is what it looked like after I replaced the fabric. I got the headliner material from a fabric store for about 7-10 dollars. And I used 3 cans of 3M headliner adhesive. It took me about 3hrs to do. I let the headliner sit for a couple days to cure, then re-installed it.
