Here are some pictures of a Carolina Wren house in my parents' yard in Bourne, MA (Monument Beach to be specific). Each year my mom has at least one Carolina Wren family nesting in the yard. Usually they go after some of the more traditional bird houses she has up, but this year they decided to nest in an ornamental bird house, not meant for actual birds!
Since Carolina Wrens are so small, this bird house actually suits their needs just fine. Here are some pictures of the wren nervously looking out and waiting for me to get in my car and leave. Right before this, the bird was bringing food to its babies- specifically a nice green inchworm.
Carolina Wren House:
Carolina Wren House in context of the yard (you can see how small the house really is):
I had hope to capture the Carolina Wren call on video, but I just wasn't fast enough with my camera. But I do have an older video on my blog featuring the Carolina Wren Song.