I posted a shot on Instagram about some DIY inserts I had made for my clear Olloclip phone case. Well, Olloclip came across it, and asked me to share the whole process in detail on their blog! (Woot, woot!) So, I shared my method in detail on their blog (which can be found here). You'll have to go there to see the details, but here's the picture progression.
Now, because I was writing this expressly for the Olloclip blog, I only talked about that, but really, if you have any clear phone case, you can do this too! The measurements will be just a little different, but it's easy to do!
Now, go make yourself some new, pretty case inserts! And I won't judge you if you run to the nearest store to get a clear phone case or some pretty paper. ;)