Using what ya got- Updating a Bookshelf

Being in a small apartment means we need to maximize the space we have.  Being on a tight budget means we need to maximize the space while using what we already have (for the most part).  We have this little oak bookshelf which fits perfectly in front of the office door.  It was cute as it was, but I get bored and always feel the need to change things.  So it got a coat of paint and now feels like a whole new piece! 

What do you think? Should I have left it oak? Do you like the painted insides?