Combined with things like the Plasma Panels Collection it is pretty impressive what one can achieve. Moving into the Plasma Workspaces 2 era, this is only going to get more interesting as we introduce the Look and Feel packages that compliment the icon and SVG themes and bring the various user experiences (desktop, netbook, tablet, etc.) closer together for fast UX switching.
One thing I keep dreaming about is a group of artists who enjoy this kind of work and have experience bending Plasma to their will coming together to create some ellegant and distinctive artwork and then pitch that work to the wider KDE art community. No asking of permission involved, just come up with a refined and audacious proposal for the desktop theme. In the worst case scenario we'd have something great for users of Plasma workspaces to optionally select .. and in the best case scenario we might find consensus on a new visual twist for Plasma Workspaces 2.
Until then, I'm enjoying the swell of art and presentation that can be used right now with Plasma Desktop.