Elegant Cosmic Sky Gradient Vector Prompts for Wall & Home Decor Stickers

Design a collection of clean, vector-style cosmic sky gradient backgrounds optimized for wall and home decor stickers. Use flat colors, bold contrasts, and celestial motifs without shading or complex gradients to ensure crisp, scalable images suitable for die-cut sticker production. Incorporate placeholders [COLOR], [ELEMENT], and [THEME] to facilitate customization for various celestial themes—such as starfields, nebulae, planets, and constellations—on a pure white background for maximum clarity and visual impact.