Surprised no one has made a post about these things... The Queen Tackle Switch Blade is awesome! Has potential to be the next big thing in my opinion. You attach it to anything with a vertical eye, in my case I use them to make chatterbaits.
You may or may not believe this, but they run just as well as a Jackhammer (when setup properly), with more customization, for 1/3rd the price. You get to choose blade size/color, head size/color (usually needs at least 3/8oz+ for small and 1/2+ for large), and hook size just by mixing and matching with whatever you like. I normally just use the small silver blade pictured, they're the same size at a jackhammer blade, but you can use the large blade for even more thump. I know this is starting to sound like a commercial but I'm just sharing my personal experience. I caught lots of 4+ pounders on these this year!
I've heard of people using these on lipless crankbaits, swimbait heads, big shaky heads, or even spinnerbaits and Alabama rigs. Would be curious to see your inventions with em!