This would’ve been a fun design school assignment. For his iOS (Old School) project, digital product designer Ben Vessey has taken over 100 common app icons and re-worked them in classic Mac style:
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Vessey has worked out a way that you can install these onto your iDevice using Shortcuts and his monochromatic wallpaper, and is selling them as a set for £3.99 (USD $5.55).
Source: core77