Some time ago I happened acros Jon Schindehette's blog, if you are unfamiliar with the name, he is the Senior Art Director for D&D.
I found his blog to be a mine of useful information, and Jon himself to be a very obliging person, who, at the moment is working very hard (in his free time, I might add) to build a community of artists interested in game art illustration and design.
Part of this effort are the challenges he is holding regularly.
The one I made this piece for was called 'Variations on a Theme' and involved choosing a D&D race and designing 3 variations of armor for it.
The race I went with was the Eladrin, and I chose to depict the three classical variations on armor: light, medium and heavy.
The full line-up can be seen on mr. Schindehette's blog
here (it's a long post, make sure to scroll down).
Feel free to go over, browse the entries, discover the current challenges and/or vote (he isn't allowing anonymous votes anymore, though, so, if you do, either log-in or put your name somewhere in your post) .
And this is my entry