These are great ideas - and the best part is that you can get them all at the $1 store! One of the best gifts I got when I graduated was a giant tub of stuff to use in my dorm (scale it down if you need to):
-- laundry soap (here's where samples come in handy), fabric softener, quarters, hangers, spot cleaner
-- towel/washcloth (wash before giving to make it fluffy), plastic shower caddy, cheap flip flops (for "shower shoes"), shampoo, conditioner, body soap, loofah
-- snacks! granola bars, little debbie snacks, cookies, candy, gatorade/water, peanut butter, crackers, etc
-- first aid kit: bandaids, neosporin, tylenol, day/night cold medicine, cough drops, cold/hot packs, ace bandage, tums (put all in a small box - they have really cute decorative ones at the dollar store)