Envision a futuristic calendar icon that incorporates sleek lines, neon colors, and a holographic effect to give it a futuristic and high-tech appearance.

Design a calendar icon that resembles a traditional paper calendar, complete with intricate details like paper texture, torn edges, and a vintage-style font to give it a nostalgic feel.

Create an illustration of a calendar icon with a minimalist design, featuring a simple grid layout and a bold font to highlight the dates, with a subtle gradient background to give it a modern touch.