Have not yet read the other comments, will do so after posting.
My favorite thing to give are homemade treats, but that is because I like to cook. Good bets are quickbreads (pumpkin, gingerbread, banana) and fudge and cookies, or even pie.
It also helps to know your audience. If you are going to make baked goods, make sure you know whether someone is allergic to peanuts or has celiac disease or diabetes. I have a running list of no-nos for my family and friends.
If you know your friends like to cook, you can give them a little (don’t spend too much or they’ll feel awkward) cookbook, wrap it up in a tea towel tied with ribbon and hang some wooden spoons or cookie cutters on the present. Like This.w.1500_s.fit.jpg
I would also make (or you could buy) potted succulents. They’re very pretty, low maintenance and most people can’t kill them, even those people with a brown thumb. You can buy a very pretty, small pot, no more than say 6 inches across and put 3 or 4 itty bitty succulents in there (make sure to use cactus and succulent mix). Ruby Ball Cacti are especially nice for a Christmas arrangement because of the color.
I also give poinsettia plants. They’re gorgeous and come in all sorts of new colors, in addition to the traditional red ones. I like These and These and These
I also like little baby Christmas Trees which may or may not be actual pine trees, but anything that is purposely shaped like a pine tree in a decorated pot is nice. Like this Rosemary Tree or This
Anything from Swiss Colony or Hickory Farms or Harry and David Just make sure to adjust your order depending upon the dietary needs of your hosts (like don’t give salami to vegetarians, of course).
You can always make some home made mixes too, like Soup in which you put all of the ingredients into a mason jar, wrap it with ribbon and make a tag that lists the ingredients and gives instructions on how to make the recipe. You can also do that with Brownie Mix You can also do that with Ranch Dressing Dry Ingredients
If you happen to have some cute photos of the host family with or without you also in the picture with them, you can make up a 4X6 or 5X7 print and have it framed.
If you feel super ambitious, you can make Compound Butters
A set of Tea Towels which if you are feeling ambitious and crafty, you can wrap in brown kraft paper that you have decorated yourself with Potato Prints
Jarred jam, chutney, pickled vegetables,olives, olive oil, vinegar, maple syrup or what have you from one of your local farms.