multicolored
斕 centers on a rich mixture of colors appearing together: something multicolored or variegated.
斕 combines 文 (pattern, writing) with 闌, which likely contributes the sound and may suggest a screen or barrier, together evoking a patterned, multicolored appearance.
The left side 文 suggests decorative patterns, and the right side 闌 looks like a gate with intricate bars. Imagine a gate painted with many bright colors: 斕 is multicolored.
For ラン, picture a rainbow-colored lantern hanging on the gate: lantern -> ラン, and its light makes the gate multicolored.