Harry Potter cake? (question)

Today, my friend asked me to make her a Harry Potter themed cake for her eighteenth.
The only problem is that I'm having trouble figuring out what to put on it.
So I started listing things that would be fairly easy to mould/pipe onto a cake.
This is what I have so far;
- spell books
- Snitch
- a Ravenclaw scarf (her favourite house)
- glasses
- the Hogwarts motto
- galleons/sickles/knuts
- broomstick
- wand

I'm thinking that I won't actually make all of those things, so here are my questions :)

1. What else could I include on this cake?
2. What is your favourite Hogwarts house?
3. Who is your favourite 'Harry Potter' character?
4. Do you read AverageWizard?
5. Completely off topic, what is the most awesome eye colour?

Oh and just randomly, look at this space invaders cake that I made a while back.
http://twitpic.com/xa2z9