Creative Prompts for Keyboard with Rainbow Keys Sticker Design

Design a clean, high-contrast vector illustration of a keyboard featuring rainbow-colored keys. The keys should be filled with solid, vibrant colors in block style, outlined sharply in black. No shading, no gradients, and a pure white background to ensure a crisp, clear appearance suitable for die-cut stickers. Insert placeholders for key labels, layout, or color specifications to customize as needed for various design variations.