A few years ago I shot a lot of photos with a Canon FD 500mm f8.0 mirror lens on Olympus and Panasonic mirrorless cameras and was specifically looking for distorted photos. I wanted to take advantage of the "doughnut hole" bokeh effect and I wanted to apply high contrast and high saturation effects. I like some of the results that I achieved because I didn't want normal, realistic images.
Below are links to some of the photos I shot:
https://www.flickr.com/photos/stevemuskie/7461428250/
https://www.flickr.com/photos/stevemuskie/7289998096/
https://www.flickr.com/photos/stevemuskie/7420324660/
https://www.flickr.com/photos/stevemuskie/7199188584/
https://www.flickr.com/photos/stevemuskie/7483662058/
https://www.flickr.com/photos/stevemuskie/7085755651/
https://www.flickr.com/photos/stevemuskie/6623779833/
https://www.flickr.com/photos/stevemuskie/6622732567/
https://www.flickr.com/photos/stevemuskie/7122163809/
https://www.flickr.com/photos/stevemuskie/6247439427/
Here are two pictures of my mirror lens:
Olympus OM-D E-M5 and Canon FD 500mm f8.0 Mirror Lens on a Kirk Gimbal Head
https://www.flickr.com/photos/stevemuskie/7930325384/
Panasonic Lumix G2 and Canon FD 500mm f8.0 Mirror Lens
https://www.flickr.com/photos/stevemuskie/6247769736/
I'd enjoy hearing about your experiences with mirror lenses if you have shot with one.