5 years ago, when I adopted Diesel, I bought this toy. There was a round scratch-pad in the middle made of cardboard and she would work her claws on it every day. After a while, there wasn't much to scratch off of it so I got rid of it. I couldn't find a replacement and it bugged me. A few months ago though, I saw a tutorial online to make a scratch-pad of my own. So I gave it a go. I finished it last week and Diesel has been enjoying it ever since.
Keri Smith has a thought provoking post on her blog. Go read it if you have a minute.