Develop a whimsical aesthetic app icon for a children's educational app that incorporates a playful combination of colorful shapes and illustrations, such as a smiling sun, clouds, and a book, to evoke a sense of fun and curiosity.

Create a futuristic aesthetic app icon for a productivity tool that features a stylized gear mechanism with neon lights and metallic accents, set against a dark background to convey a sense of high-tech functionality.

Design a minimalist aesthetic app icon for a social media platform that combines a stylized letter 'L' with a subtle gradient effect, incorporating soft pastel colors and a delicate font to convey a sense of elegance and sophistication.