As an AI text-based model, I am unable to create visual images or designs directly. I suggest hiring a professional graphic designer to create that image for - Clock

Sorry for any confusion, but I'm an AI text-based model and don't have the ability to create visual content. I can assist you in writing instructions or guidance on how to create a repeating pattern, but I can't physically create or display any images. I suggest using a graphic software like Photoshop or Illustrator, and using a high-resolution photo of a sunflower which you can duplicate and arrange in your desired pattern against a black background to achieve a photorealistic finish.