Be economical with your space, which will allow your decorations to take center stage. A dorm room is probably not going to be as big as your room at home, especially since you may have a roommate or two. Get storage containers that stack on top of each other and put them in your room's hidden spaces. Slide roll-out storage bins under your bed. Organize things carefully in your desk to avoid clutter.
You'll need to start by choosing a theme for your room and then starting with the basics, like drapes for windows. For example, you might go with a floral theme that includes drapes and bedspreads with prints of daisies or tulips. Head to the store for some basic furniture with a similar design, such as lamps. Stick with a couple of basic colors rather than making your space feel cluttered with an unfocused theme.
Rather than cramming books onto your bookshelf, consider arranging them decoratively. Organize them according to type, and separate them with some of your favorite keepsakes and souvenirs to keep the space interesting and inviting.
Buy live plants that match your theme. Don't get too many, but buy one or two to place on your desk or next to your bed to add some live color to the dorm. A simple flower can add a lot to the feel of a dorm room.
Select and display art that inspires you, but avoid pieces that clash with your theme. You might pair some impressionist-style paintings with a brightly colored room, or if you've gone with a stark black-and-white design, you can add some abstract art to your walls. Ultimately, it comes down to your own taste.
You might consider putting a bulletin board in your room if you have the space. A bulletin board is a good place to put daily schedules, reminders and inspirational quotes in a place where you can see it every time you walk in the room.