I did a lot of work on this photo and I thought it might be interesting for people to see exactly what I did. There are actually 2 versions of this, this being the original one I did. I was really happy with this one too, however I noticed something after I was all done - there is a reflection in the eyeglasses. I looked at it carefully and it would be VERY hard to get that out, so I decided a 2nd version was in order and I'd change the background to match more closely the reflection.

Here's the original of the photo. Notice the background. It's actually my mortarboard from when I graduated high school, hanging on something. Now it's out of focus, and the background fades away nicely, but I really wanted the focus to be on Glenn's face. So the background had to go. I tried various ways of lightening it up, but it ended up looking TOO unnatural. Eventually I settled for painting the background an off-white color completely. This still didn't look right of course. I wanted there to be some texture to the background, it'd look too fake without it.
I used splatter brushes (basically paint brushes in the editing program that are in the shape of a paint or blood splatter) with a darker color to make botches and blobs in the background. The sharp edges of these wouldn't look right, so I selected everything that was the background and gave it a nice lens blur.
After all that was done, it was still a little too plain for me, so I cut out a piece of this picture:

, notably the base of the bridge. I took that and put it over top of the rest of the picture, and then lowered the opacity until it blended right. I may have even "erased" the edge of it slightly so it would blend in better.
The final step was to give the picture that "Kevin" feeling, kind of a washed out, unnatural look. This was done by created a new layer based on the original image, desaturating it (removing the color) then using a layer blending technique (I believe it was "Soft Light").
It was at this point that I realized there was a reflection in his glasses. So I followed the steps from before more or less but instead of the bridge used this picture:

as the background. I blurred them a bit less so they were still recognizable.
The end result was of course this:

.
And there you have it.