I'll share a few of my top secret modifications
1) Instead of using a rattle on my jigs, I go to the craft store and buy small metal jingle bells. They will slide right on the hook, and I'll hold it in place with a piece of Berkley Power Worm. Now I've added a different sound then everyone else is doing, and I've added a small amount of scent/taste (Powder Worm) on the hook.
2) When I make my own jigs, and powder coat them, after dipping them in the fluid bed and they are starting to cool down, I'll push my thumb into the back of the jighead. This imprints my fingerprint on the back of the jighead, giving the head a textured finish, that I believe gives off more or a different vibration then a normal jig. It's possible this is just a confidence thing, but I believe it works better.
3) When I buy a brand new crankbait, I'm not a fan of the bright colors, so I leave it in a window for a few weeks, so dull the colors. When it's "done" it looks more natural.
4) If I'm fishing heavy cover with a square bill crankbait, I'll clip off the front facing hook on the treble on the front and back. This keeps the bait from getting snagged, but still catches fish.