One of the things I like about Anna's bags is her use of rivets and other metal pieces which, I think, really adds a professional look to a bag. And, I am really into using light weight leathers and suedes these days which, again, I think adds a lot. If you are looking for smaller pieces of leather, there is a wonderful company called Brettuns Village located in Lewiston, Maine. It is primarily mail order and is only open to the public from 10 - 2 on the first Thursday of every month. But they have lots of small and large pieces of leather in various colors. And, since it's unlikely that many will be lucky enough to make the trip up there, they are very helpful in answering any of your questions or making a recommendation if you tell them what size and what project you are looking for a piece of leather for.
The space between the rivets is open and great for a cell phone, sun glasses, pen or other necessities one needs to reach quickly. I couldn't find exactly what I was looking for to use as straps so I ended up with brown webbing which I stitched red grograin ribbon onto.
Below is just a quick zip make up case to throw into the bag!