Olivia Books by Ian Falconer

I love the Olivia Books by Ian Falconer. The illustrations are so amazing, interesting to look at and the story is amusing and captivating. I am not so sure my 15 month year old boy is as impressed although he does seem to like Olivia's Opposites. We have read most of the books. I am hoping that Mr. Falconer will write some more soon. I know there are some books that are branded Olivia, but aren't by Mr. Falconer. We don't tend to read those since they're not as good. I have a couple of suggestions or themes:

An Olivia Book on:

• Halloween 
• Valentine's Day
• Thanksgiving
• New Year's
• Friends or her Best Friend
• Visiting Paris
• Visiting London
• What does Olivia do at school? 
• Olivia Cleansher Room

Do you have any other ideas?