Live with parents/roommate: cook him a nice dinner and go to the movies. Make extra for your friends/family.
Live on your own: cook him a nice dinner and watch a movie at home with a bottle of respectable wine. Let him choose, or watch a horror film so you can snuggle.
This shows you can take time out of your day for him, and time is the most precious gift we can give. Also, the way to his heart is through his stomach, and it doesn't have to be perfect.
Nothing healthy or fancy, just steak and potatoes, and ice cream/pie. Ice cream is an easy, I-don't-have-time-to-bake desert. Bake the pie if you know how (though even if you don't he might be touched by the effort). If you want a zing of the romantic, the pie comes with whipped cream, and every guy I know never things of that as a desert just for pies.