Using an aquarium air bubbler is a fairly inexpensive way to speed up the rooting of larger cuttings.
For this house you'll need 1 " styrofoam or construction foam insulation available at Home Depot, decorative mini garland items, dark brown paint, and white latex caulk. Optional items: clear plastic for the windows, mini decorations and tiny battery lights.
Here's an idea for turning a large hollow Christmas ornament into a planter.