Has anyone tried a "leather" turntable mat?

Great question! Recently I've had the same one.

My turntable platter is copper this sounds best leather is good for a jacket!!

Kinky little sucker, aren't you!

No, but interesting and different. I have tried many things both purchased and home-made in an effort to better the sound of my TT of which I already feel is wonderful. I have finally realized that the solution, for me, is not to change the sound of my TT, but to free its sound (IMO). Remove any additves, and stop the normal vibrations and noise that muddies the sound. Once you get rid of the grunge, the TT can now speak for itself. If you don't like what it's saying after that, maybe you need a different TT.

Finally, I found what I was looking for with an SRA Base. This tweak was big for my TT, and when I add a mat now, I hear an additional color that I don't care for.