This is one of the pages out of my sketchbook. As usual, it started out with an idea and then went kind of crazy...
At the top and to the right are my designs for an outfit for the 6th Doctor. The guy really could have used a better costume for his run on the series, and he really could've looked quite cool. Instead, we got JNT's "marketable" approach to the Doctor's appearance, and thus Colin Baker ended up looking like a crayon box exploded. Sigh.
Anyway, I think he would've looked awesome in a design similar to the one I've drawn. Maybe some blue-ish tones to his attire.
And to the bottom left we have... Well, it's my take on the 4th Doctor and Sarah Jane Smith in the Matrix. That's probably the best way to describe it. Like I said, my sketches tend to get crazy.