I quite often use images of myself as a child in my work, but I've never really thought about why.
I recently came across a lovely book which deals with just this topic. It's called 'The Art of Personal Imagery' by Corey Moortgat, and it's full of interesting ideas and techniques to help the reader find their own personal imagery and symbolism, which can be used in any kind of artwork. Here's a simple page using collage and some gold foiling over a pink wash.
