Most of you know I love birds. One Birdie, the red lored amazon, is sitting behind me as I speak, trying to break the hair clasp out of my ponytail. No romantic interpretations there. I think bluebirds are used decoratively more than most birds. I guess because they are so pretty. In fact, they are quite shy. Rarely do you see them at the feeder, preferring instead to eat bugs and such from the field. Nevertheless, they are beautiful and worth a watch. Here are a few bluebird things I have. Notice the small plastic potted plant thingamajigs. Perhaps they were for a teeny potted vine. 
