variegated, striped, marbled
斒 centers on a surface marked with irregular patches or streaks of different colors: variegated, striped, or marbled. The idea is a mixed, non-uniform pattern.
斒 combines 文 (pattern, design) with 扁, which likely contributes the sound. The character expresses the idea of a patterned or variegated surface.
The left side 文 suggests a written or drawn pattern, and the right side 扁 looks like a flat object with marks. Imagine a flat stone slab covered with variegated, striped patterns drawn in ink.
For ハン, picture a hand painting variegated stripes on a canvas: hand -> ハン, and the hand creates the marbled pattern.