Speaking of Morrowind, there's a lot of great concept art for that game made by a guy named Michael Kirkbride. He's part of the reason designs in the Elder Scrolls 3 looked like this:
While designs in the Elder Scrolls 4 looked more like this:
You can find the entirety of TES 3 concept art here.
But I know you wanted painted pieces which is why I'm referring you to the Elder Scrolls Renewal Project (better known as Skywind). Not only are they doing a lot of awesome paintover and 3d model work with Kirkbride's designs, but they've contributed a TON of completely new designs in a similar style. The whole project is to recreate the Elder Scrolls 3 Morrowind using Skyrim's engine and completely new assets, and while I don't know for sure that they'll ever completely reach that goal they HAVE made some amazing art assets in the process. I swear the whole thing has become kind of a dick measuring contest for some really talented concept artists, 3d modelers, and even sound designers. Keep an eye on it.
Here's a sample:
And if you don't want to dig through the forums for an hour, you can check out a nice selection of pieces on their DeviantArt page.