Skins l, n, and p are awesome! (Actually, I think l is my favourite.) As for the swords, the shapes of a, b and c are nice (in this order: a>c>b), but I admit that for Riven, the reforged sword should be fuller and not too "lightsabery"/ethereal. It just seems to suit her better, in my opinion.
I think your on the right path. The top (weapon only designs) give me the ethereal vipe cause I can see the blade, I can see it's solid, but it has some more to it, an aura for example. The rest lack that.