Your room should reflect your personality. It is really the greatest representation of you. It should suit your taste and should also make you feel comfortable because this is your last resort. This is the place you go to when you want to relax and forget about the world.
The Right Bed
Buy the right kind of bed for you. Just because a bed is big doesn't mean it is perfect for you. You need to find out the full size bed measurements on the web. You need to measure your room well and leave enough room for you to move around.
Scene and Sound
Sounds and scents are often ignored and downplayed but it really does a lot to your mood and condition. Find the right kind of scent that will relax you, energize you and use what is necessary. The speakers for your CD player must be able to maximize the quality of your music.
The Paint
I suggest you go for warm neutral colors when you are painting the walls of your room. This will allow you to be flexible in the color of sheets and other pieces of furniture. I am guessing you don't want to confine yourself to one design. I am sure you want some sort of flexibility. Neutral colors will allow you to do that.
Quality Sheets
Make it a point to buy only the highest quality cotton sheets you can afford. Remember that this is where you lay your body for a good night rest. There is nothing more rewarding but a real nice sheet when you rest at night. Buy several kinds in solid colors or with prints. You will most likely want to change it often both for hygiene and for aesthetics. Be ready with the different moods you might get into.
Your Prints
This is your room and there is no stopping you from putting stuff around your room that will remind you of happy times such as photos of your family members or friends. Buy some unusual portraits and frame the photo with some memorabilia from the person or place in the photo.