Halo Loot

I am looking at getting some Halo collectables, memorabilia, etc for my room. However I’m not sure what would be good to collect and what wouldn’t?
A little bit of info about me so you can suggest certain things appropriately.

I’m 21 years of age, I can make pretty much any modification to my room within reason, so I can hang things from walls, ceiling, etc. I’m doing this because for the past 10 years or so I’ve been battling cancer and the horrid effects of chemotherapy, I had my 23 emergency operation Friday morning and I’ve accepted the fact that this is my life, so I’d like to make it as comfortable as possible! (Halo is my escape) and I’d love a project to keep me occupied! If anyone has any ideas, pictures, sites to go to I would be very appreciative! I do however live in Australia so maybe some things aren’t available here? Thanks guys :slight_smile: