The Appearance Manager even had a "scheme to theme" feature, which translated Kaleidoscope schemes into Mac "themes." Aqua, the much-lauded look and feel of OS X, is essentially an updated OS 9 theme.

If the word Kaleidoscope means anything to you, you’re in for a treat. As spotted by Rob Beschizza (via BoingBoing), Mac Themes Garden features a collection of nearly 4,000 Classic Mac OS GUI ...

OS X Lion Ultimatum is simply the most impressive jailbreak theme we've ever seen. Click here to see pictures > If you've ever wanted an OS X clone on your iPhone, this is it. We're blown away by ...

Just as it's not possible to see what Android 1.0 was like when it was new, installing Mac OS 9 on an old PowerBook in 2014 does not actually show you what it was like to use Mac OS 9 in 1999.