http://www.inspirationgreen.com/index.php?q=insect-habitats.html
Vehve, our boy scouts made some of these for a nature garden once. Are you looking for something like that?
We watched a Mama Carpenter Bee make her nest last summer. She hollowed out a hole under the deck rail. It took all my mom had not to kill her until I explained she was too busy to bother us. Now Daddy bee was another story, he buzzed us a couple of times but no stings. She worked almost all morning and then he stayed close by most of the day while she stayed in the nest . It was so cool to watch. Mom said after we went back home, she killed them.It's ironic - one of the biggest pest we have around here are Carpenter Bees. They are a large bumblebee, and chew their own tunnels into any exposed wood. Painting the wood may or may not deter them, but as you can imagine, 1/2" holes drilled lengthwise in 2-by lumber can seriously compromise its strength.
Another pest we have around here is a tiny little bee, maybe 1/4" long, that will fly/crawl inside clothing, and sting when it gets trapped between clothes and skin. I can't count the number of stings I've had from those little monsters!

I love mine, can't wait to use it again.I love that brinsea brooder heater plate and the chicks are so brave! I had them not in the box, until they started pecking the guitar in the corner. Cuteness over load!