Creating appealing thumbnails without Photoshop is possible using free or online tools like Canva, Pixlr, or Fotor. These platforms offer user-friendly interfaces, customizable templates, and a variety of design elements. Choose captivating images, incorporate bold text, maintain a clear focal point, and use vibrant colors to make your thumbnails eye-catching. Don't forget to ensure readability and simplicity, keeping in mind that thumbnails should convey the essence of your content at a glance.