I get the most *amazing* pads from EZ Whelp - they are called "laminated pads" -- and they are uber thin and uber absorptive; they also have a certain stiffness to them which is nice bc it means they truly lay flat (not wrinkly). I cannot believe the amount of urine they can hold! They look attractive too bc they're just a neutral, medium brown color.
They are these ones:
Buy Waterproof Pads for Whelping
But I also know that our YT member 107barney sells wonderful pads too - and people love them! I think her pads also have different patterns/colors and stuff...? You could PM her and/or visit her site.