This isn't necessarily a money maker, but my favorite item to sew is fabric gift bags. I use them instead of wrapping paper for any and all gift-giving occasions. They make part of the gift and can be reused over and over. (No one who receives a gift wrapped on one of these bags ever wants to return the bag!)
I even give my friends and relatives the bags themselves as gifts, and they love them. It's fun to make gift bags in holiday fabrics or use up fabrics from your stash. I make lined bags that use two coordinating fabrics. This is a great stashbuster for sewers or quilters who have too much fabric.