"Create a black-and-white illustration tailored for a children’s coloring book, intended for ages 3-5, featuring a scene of unicorns having a picnic. The drawing should have bold, thick lines for easy coloring. Picture the unicorns sitting on a large, simple-patterned picnic blanket in a sunny, open field. Include a picnic basket, plates with simple shapes like sandwiches and fruits, and a large, friendly sun in the sky. The scenery should be minimal, perhaps with a few trees or flowers around the edges, ensuring the main focus is on the picnic setup and the unicorns enjoying their day out. This scene aims to provide a clear and delightful coloring experience for young children.