Love the discreet hook points, may be an issue with alarms though...
Right, you asked for ideas 
Think about acoustics carefully, they can make such a difference.
Make sure that if you have the lovely big windows for classrooms that you have a way of blocking the sun from turning them into greenhouses! I used to boil in one of mine. If the sun will be angled into the classroom, make sure there are blackout blinds or you won't be able to see the IWB.
Oh, lovely deep windowsills that you can put tactile displays on.
In terms of the whole school, sometimes it's nice to be able to pop your head into someone else's classroom so if you are planning to have parallel classes then maybe doors linking them would be good? Just a thought. Or even fold back doors to make one massive classroom if it was needed.
Staff toilets tucked away rather than going straight on to the corridor. Have always hated children shouting 'Mrs Looks is having a wee!' in gleeful tones.
Music room. With a piano. And sound proofing 
Kiln for firing pottery, so much nicer than air dry.
Large central resources cupboards for art and DT type resources.
If it's a big school, try to make the office/photocopier/staff room the centre of it. Otherwise the staff at one end can feel isolated from others. Plus it can be a reeeeaaally long walk to the photocopier.
Don't try and make the classrooms a fancy shape, it just makes table planning a nightmare. Nice big rooms with ventilation high and low if possible. If it's really windy but hot, all the work flies away when you open a lower down window!
I would have loved a room that children who are having emotional problems (ongoing or temporary) could have seen as being a 'home' whilst at school. A breakout room (can't remember the fancy term for it).
Maybe I should be an architect, rather than a teacher. 