To create a "paper" look or physical papercrafts for , you can either build digital levels that mimic a hand-drawn style or create real-world 3D models. 1. Digital "Paper" Style Levels
If you want to bring the game into the real world, you can create 3D paper models: Search results for Geometry Dash
Creators suggest adding eraser "dirt" and mostly erased sketches in the background to give it a "used notebook" feel. To create a "paper" look or physical papercrafts