The Rainbow-Colored Sidebar plugin adds automatic, theme-based colouring to your vault's sidebar folders and files without needing any CSS tweaks or file naming conventions. It supports nine color schemes, including rainbow-based gradients, blue-themed palettes, random mixes, and an accessibility-friendly mode with higher contrast. Colours are applied based on A-Z folder order and cycle infinitely, making it suitable for vaults with many folders. Active files are visually marked, and users can easily switch themes or enable contrast options from the settings. It's a simple yet aesthetic enhancement for users who want visual clarity and customisation in their workspace.