Macro filters

I have always loved the idea of taking a picture that lets you see more or differently than the naked eye.  Macro photography doesn't have to do that but my personal preference has always been, let me see this differently, bigger, like I'm looking through a microscope... 

Many years ago when I was just starting out in the digital photography world and had my first camera that allowed interchangeable lenses and filters, I started out with macro filters instead of a macro lens.  The results may not have had the perfect detail I can get now, but the filters could provide an ethereal quality that I do not get with my macro lens.