Yeah, I'll try to get some sample for the future but just want something for now that won't look weird with a bit of paper showing. So, 9501 - sounds good. now, unfortunately I was just about to make an order from Cheapjoes and they don't have that number. I'll look around at other sources.
I'm hoping to standardize the mat color - at the moment it's prints of some paintings but in future will be some B&W photos also on fine art velvet. Standardizing between those two needs might not work perfectly but I'll give it a try.