Nice idea Tan!

Already great suggestions!

I would definitely go my own clothes and slippers (although gotta be prepared for the fact that they might get messy lol!).
Fave music/DVD's?
Your own drink bottle.

I agree with the lighting - I couldn't stand the bright hospital lights so we turned them off and DH asked my mum to bring in my bedside lamp, worked a treat and helped me to relax more. Of course the lights had to get turned back on at the business end of the birth.