Tsammy has always liked pingpong balls - we have quite a large collection now, but his favourite has always been the red one, as you can see as he plays one evening after his dinner. Tsam can quite happily play this for HOURS if he's in obsessive mode; which is why he used to have a toy cricket hanging from a slack spring in his tank. It's now on his running slope after he bit one foot off it. (Don't worry, he didn't eat it - it was too crunchy.)
I'll have to take a movie of "Dragon Fishing" at some point too - watch this space for more.