I am thinking if you can make them a nice sized lap quilt in colors that compliment either their decor or color preference you cannot go wrong. As collectors they would appreciate a handmade item more than anything else. They will understand and appreciate the personal effort and skill it takes to create something. In Denver a lap quilt will be appreciated even if it is just a quilt to keep in the car. If you don't know about their colors go with some basic color dark/light combination and you cannot go wrong. Good luck and enjoy your trip.