The green and blue linens are the standard linens that come in the Living Seas. You can change the linens for a fee but I haven't seen any pictures of them with purple linens.
Thanks! I am trying to decide if I should upgrade to purple linens or not. I guess it really will depend on our budget -- that will probably be one of the first things to get cut.
Just a little note... they are letting me switch out the green overlays for white without any additional charge. Not exactly, the purple you were talking about, but it sounds like if you want the standard white it isn't a problem.