At 17 months he couldn't care less about the black board but really loves slamming the doors closed and locking it too. The mirror is a huge hit (bought as set of 3 in Ikea) as the kid keeps kissing his own reflection and laughing at the guy 'opposite'. The light switch, bicycle bell, and hanging keys etc. on hooks is also very popular.
The flag pole (on the left side) with two flags that are supposed to be moved up or down is a bit of a challenge. For now there is no interest other then trying to rip the flags off which, thanks to the superglue, hasn't yet been successful.
The little car is a laminated picture with a magnet.
The top of the switch could work well as a place for chalks. If someone wasn't trying to eat them...
Taking the kiddo to a DIY store helps. We just picked items he was the most interested in. Well, those appropriate ones, you should have seen what the kid actually wanted to take home!