One of the best books I ever got for my granddaughter when she was about 3 was a book called 'You Choose' by Pippa Goodhart and Nick Sharratt .
It's actually a book without any words but lots of colourful pictures on each page. It's great for the imagination, the child chooses things like where she would like to live, palace, castle, tent etc. How she would like to travel, boat, plane etc. a great book to get children talking. My grandaughter is nearly five now and still loves looking at it, its one of those books where you find something different in the pictures each time. I actually bought two books, one to keep here with me and one to take home, she liked it that much.
It's still available on Amazon.