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Where do all the icons go?
This article hopes to clear up any confusion surrounding where application developers and artists should install their KDE icons.
First some (simplified) history:
KDE 1 used locolor icons, they only have 16 colors and look pretty plain. KDE 2 used the hicolor theme, similar style to locolor but with more colors. KDE 3 changed to the CrystalSVG theme which we know and love today.
KDE 3 also saw the adoption of the freedesktop.org standard which changed hicolor from being an artistic theme to being the fall-back folder. The hicolor theme was renamed to kdeclassic and most of the icons were moved to kdeartwork/IconThemes.