Like others said, it depends. For me personally, I would love really good chocolate, gift cards to my favorite stores to go shopping, Starbucks gift cards, or one of my favorite (funny) movies on DVD.
My awesomely awesome friends sent me baked goods from my favorite bakery, and one amazing ML'er and friend sent me an edible arrangement. Both were excellent, and so touching. I will say this - truly, just the fact that they thought of me meant so much.
Oh! Another bf sends me a really engrossing book every time I get shit news about my mom. That is amazing. And my sweet friend sent me a cookie bouquet when the girls were born, and I ate all of them, lol. And oh, someone else sent me Shari's berries, that was awesome, too! Hey, I have some kickass friends.