Cat toys are a huge joy!
Cats have a special place in a household - somewhere close to the top. If you really want to make cats lose their dignity (in the nicest way possible of course) then give them toys - this brings out the hidden kitten in all of them.
The crinkle bags and tunnels are fantastic fun, they make all the right noises and have a removable/replaceable cat nip pouch.
Most people don't want to train cats but discouraging them from precious ornaments and from getting on kitchen worktops can be a problem, the Paws Away deterent works very well - even when you aren't there!