My cat's favourite toys are a ball of paper or a ball of tin foil. He
will bring it to me and drop it at my feet/in my lap for me to throw -
this can go on for ages! He also likes paper of any sort -  but
especially the bit I am holding/reading/writing on - plastic bags,
cotton reels or anything I am showing an interest in.

Kate and Angus

My cats' favourite "toy" is a small round piece of wood. It started out as a
cover for a screw hole in some pine furniture, bu I did not put it in as I
might need to adjust the screws later. The cats found several of these wood
"plugs" and would carry them about the house. This happened when they were
very smal kittens.

Most of these pieces have been lost. Now I and the cats have moved house and
have different furniture but I kept the small wooden pieces. Every time I
pick one up they are immediately jumping up to grab hold of it!

As I type this message, Smokey, the grey cat has jumped up and is trying to
sit on the keyboard. Picture of Smokey here:
http://www.vintagetransport.org.uk/b3ta/smokey.jpg
and Smudge:
http://www.vintagetransport.org.uk/b3ta/smudge.jpg