In-game, toggle your Texture Quality (Low to High) to force the game to load the new icons . For Android (Geode) How to import custom icons into Geometry Dash 2.2!
: A versatile editor that provides templates and "Shapes" tools to design unique icons from scratch. geometry dash icon maker download
: If you want to change how the icons look visually (custom skins), you download Texture Packs . These are zip files containing replaced In-game, toggle your Texture Quality (Low to High)