Picture of the Day themes

I've been reading Becky Higgins tweets about Picture of the Day ideas (posted as {POTD Idea} if you want to search for it). I love that she is sharing ideas of her own and from other people. I have been frequenting in the hospital lately and have noticed there are an incredible amount of signs around everywhere. I thought that signs would make a great theme as part of a POTD idea. Here are a few signs for your enjoyment (they are not all from the hospital).