From my experience, prayer rugs tend to be fairly similar to one another. I'm not sure if this is considered an important part of prayer, or just a habit that people have gotten in over time. Here's a random one from the web:
Question: Should a prayer rug look Islamic?
As I understand, it is not necessary to even use one. But if one does, does it need to look the part? Or would anything comfortable and clean (and not un-Islamic) be just as suitable?
I'm thinking of getting a rug so I can pray in the office, but something that doesn't look like a prayer rug.