Describe the solution you'd like

It would be nice if you can change the texture of the elevator to any block

Additional context

The elevator would be more fitting in the floor of the buildings

I have no plans to enable to change textures because this is the "Quartz" Elevator.

If you really want to change the textures, you can manually modify the model files.
https://minecraft.fandom.com/wiki/Model

quartz-elevator.jar
└── assets
        └── quartzelv
                └── models
                        ├── block
                        │       ├── smooth_quartz_elevator.json  <- edit
                        │       └── quartz_elevator.json  <- edit
                        └── item
                                 ├── smooth_quartz_elevator.json  <- edit
                                 └── quartz_elevator.json  <- edit

If you're bothered by particles, you can hide them. (ModMenu > Quartz Elvator > Display particles: Yes -> No)