We have sale shelves lined up all around the walls of our dining room. It's like a little country store. We sell my own books (I'm an author) cookbooks, tea gift sets, local honey, jams, candies, and our own shortbread and fudge, which are always available for sampling in the snack area. Since we often have afternoon teas here for various groups like the Red Hat ladies, wedding showers and the like, we also sell vintage teapots and teacups which I simply collect from local yard and estate sales and also from culling our own vast collection. I price each according to the going rate on ebay.
We live right next door to a small farm and there are often colts, calves, lambs or baby goats for viewing or feeding carrots right over our fence. So we also carry stuffed farm animals of the same sort which I get in bulk. We also carry stuffed doggies and kitties that look like ours. We allow children here so I place the toys within reach and the moms can't resist their little ones. For the kids, it's a little souvenier of the happiest part of being here. We supply a lot of toys here for our guests, but the (real) dogs and cat are always the favorite play thing! They often buy one or two stuffed animals and name them after our dogs or cat.
One unusual thing we do is that each guest room has a shelf with a selection of books, mostly novels. We custom make bookmarks that we tuck into each book stating that the book is available for them to take home and finish reading for just $10.00. All of them are $10.00 which is quite a mark-up since each was about 50 cents at a yard sale. The books we offer are in like-new condition, of course.
Between these enterprises and our add-on romance or welcome baskets, we make enough additional income to make the effort worthwhile.
P.S. I just joined and made my initial foray into posting in the vacuum thread!