Awesome tillandsias! Admittedly until I went to Costa Rica, I found them pretty boring, especially compared to other bromeliads. Spanish Moss has always been an exception though, what with me spending so much time in Louisiana throughout my life. But after going to CR and seeing the diversity of the genus and the variety of habitats in which they grow, I came to appreciate them and even started buying some of my own. They are extremely hardy for bromeliads and seem to adapt to the California climate pretty well - I even got my Spanish Moss to bloom this past summer! I grow mine outdoors year-round in a tree, and in times when there's no rain I just spray them with a hose a few times a week. This is the first time most of mine have been outdoors in the winter, but they've handled a few very mildly frosty nights with no trouble (I'm in zone 10a). I think that even though they are tropical plants, the large trichomes on their leaves give them some degree of frost hardiness, some more than others. Spanish Moss is apparently hardy down to zone 7a.
I'll have to get a picture of my tropical epiphyte tree tomorrow morning, I think it looks pretty cool.