On iPhone, a custom icon opens an app through a Home Screen shortcut. Apple’s Shortcuts app lets you choose a photo or file for that icon; its Home Screen instructions explain how to add it.
For video walkthroughs, see these ios and android tutorials. On Android, check that your launcher supports the icon setup you plan to use before buying a pack.
Light Pink
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Pale icons can blend into a light wallpaper. Preview a few on your chosen background before changing the whole screen.
Dark Pink
Hot Pink
Flamingo Pink
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Related: Orange App icons