I would vote for this. If you want looks, you can put thisYou can get no name sorbothane pucks for audio gear cheap enough. They do absorb vibration whether it matters or not. And they won't mar your gear with one piece sitting upon another. So while I might not buy some of the claims, they are pretty good for not crazy money. Or you could use hockey pucks though they are pretty hard likely not absorbing much vibration. Maple also absorbs some vibration and maple blocks can look nice. So another option.
under your Blu-Ray and on top of the pucks. You can find all kinds of stone tiles and stone baking sheets in sizes that match your setup.
You could also just get a 2 inch thick concrete paver from Home Depot and wrap it in velvet.
I would agree with other commenters, if your Blu-Ray isn't skipping / or your analog turntable isn't reproducing sound that is not in the grooves, it doesn't need an isolator.