I think I'm in love with my palette knives. Can I say this without fear of being carted away? I think so, as there appear to be more and more palette knife painters out there. For example, see the new blog called Palette Knife Painters. There seems to be an infinite variety of things you can do with a palette knife.
I recently bought a used copy of a book published in 1971 by Coulton Waugh called How to Paint With a Knife. It's really a fun book. You can tell he loves his palette knives too. In fact, he even gives them names. (I will proudly point out that I have not gone that far -- yet!) He has knives named Long John, Big Talk, and Mini Squirt, not to mention Palette Boy. Known more for his comics than his painting, he loved to paint large paintings with his knife-friends. I could only find a few images online.