The Sky Collection. Do You Have One?

After blogging about keeping your Lightroom collection "clean", I was taking a casual trip through the images in my Delete Candidates Smart Collection when I stumbled upon this completely unaltered snap I took one October evening after arriving home and stopping to empty the mailbox.

Not much of a foreground, but boy is that one spectacular sky.  It got me to thinking, I need a "Sky Collection".  Some day I'll have an image that has an interesting foreground, but a crumby sky and then.....hello PhotoShop :).

Do you have any collections of photos whose use you've yet to discover?  Drop a comment  below and share your ideas on the topic.