Creating personalized planner

Hi! I want to create my own planner, but I want to make it very personalized to myself. I figured I could get a binder with rings and create my own inserts - which is the easy route. however I want to know how people create covers like this?? the only things I have found were to buy them in bulk for your company, but is there any way that I can just create this sleek design by myself? and I am not even just talking about the coil part - I actually mean what materials do you need to make this aesthetic cover and how would I go about it? OR do you know any companies similar to golden coil that makes things super personalized yet cute? [golden coil is not personalized enough for me]

https://preview.redd.it/n0r882il19vb1.png?width=968&format=png&auto=webp&s=27092f7b1128b92b24a6d15dbe98ffd60ea64f64