These are fun. I like One Fish Two Fish a lot and the Doug Adams one too. Silence is Goldfish is interesting too, with the one fish swimming against the tide.
I haven't read Silence is Goldfish yet but I love Annabel Pitcher's writing so I definitely want to! I don't know why but I somehow manage to add at least one kids book/picture book to every one of these posts and I guess One Fish Two Fish was it this time (and of course The Rainbow Fish). It's a problem!