These I made for my ColorPoP premade shop which you can find at EnnaTigerFox
Here are some more I did for the shop.
If you're wondering why they are two different colors, it's because the shop is all about colorfulness and fun :D
These are all 500 x 300 pixels. I find this size to be just right for chapter markers. You can post them smack dab in with the text, or you can use it as the photo you can insert at the beginning...oh, you which one I'm talking about. I think most people put a banner there.