The number of modifications that can change soft plastic baits is limitless. Why modify? For the H of it of course! Just kidding.
Lure design in general became money makers going back decades. Flies for fly fishing are nice but not versatile nor much fun when fish are deep. Lure design takes that and many more things into account such as lure properties that affect a fish's senses differently. For example: the use of metal blades (Mepps and other bladed lures) provides flash and a pulsating vibration that stimulates the lateral line.
Soft plastic modifications can be as simple as cutting off the curl tail from a curl tail grub. The action/profile is then totally different and surprisingly catches all fish species and fish sizes! Dipping plastic bodies for example in hot plastic also changes a lure's body mass and profile.
Attaching a part of one lure to another has the same effect: a change in the original fish's
strike-trigger that may or may not improve catches. But hey, they're fun to do on days I can't fish and exciting when fish strike them
consistently.
Here are a few what I call
hybrid or
Frankenstein lures (a label someone applied seeing as how my first name is Frank

).
Two grub bodies were melted together to not only increase body size after removing the curl tails, but create a
mini stick that can be rigged the usual way but also wacky rigged with grub hook in the center.



I wanted to enlarge the Crappie Magnet body and joined the tail to a long one:

This very large white sucker decided to munch on one:

Magnet tail added to a hand-poured stick segment:

Here a thin tail from one grub was joined to a segment of Fry Fry stick:

This claw from a craw lure was added to a grub body and fish blasted it!

Finesse Fin tail was added to a French Fry segment:

A thin tail was added to a different color grub body and caught this decent perch:
