Fresh white linens are a must in my bedroom. I love the smell of freshly bleached/laundered sheets. It makes me feel clean put together even if the rest of my life isn't so organized. If only white bed sheets stayed clean!
Take something you really love, a letter, envelope, photograph, a ticket stub. anything - to a printing place like Kinkos and have them blow it up for you to hang as art. An old recipe from my Grandma would be great for the kitchen.