4. Repurposed Birdhouse Conversion
Thrift stores and garage sales are full of birdhouses that never attracted a single wren. Rather than letting them gather dust, convert one into a butterfly shelter. The key change is the entry: birds want a round hole, butterflies want a narrow vertical slit.
Materials: a wooden birdhouse, a scrap of wood to cover the existing hole, a jigsaw or rotary tool, sandpaper, and bark or cork sheeting. Remove the perch, since it serves no purpose for butterflies and can block the entry. Cut a thin wooden plate to fit over the round hole, then cut a vertical slot roughly ⅜ inch wide and three inches tall through the plate. Attach it with exterior glue and small screws.
Line the interior floor with a piece of cork or bark to create grip. If the birdhouse has a hinged cleaning door, leave it functional so you can sweep out debris each spring.
Time: 40 minutes. Difficulty: beginner. Paint the exterior in muted greens, soft grays, or warm browns; bright glossy colors stand out to predators and fade fast in sun.