OK, this one was by request. This is a very simple way to
give your image a very abstract and undefined art frame. Click on the
images to enlarge the illustration if you need to. For even larger view
click on the bottom right orange square (with blue arrows).
1- Open your image. Select Image, Canvas
size. (Please ignore the History to the right.)

2- Select white. I added a 50
pixel wide horizontal and vertical canvas enlargement.

3- Select Brush Tool. I chose Size
55 pixels, Hardness zero,
Opacity 40%. Now paint the borders
so half the brush is in the white and half (or more) is into the
picture. You are painting a soft color onto the picture. I picked a soft
blue color to go with the colors in the photo. I know, it looks silly,
but bare with me. (picture has broken link -
sorry)

4- Now change the paint brush to
100%. Go around the picture again, painting LESS of the inside
photograph and ALL of the white border. This is important.

5- Next, use the Magic Wand tool,
set at 16, and click on colored border area. Select
Feather and choose 1 pixel (or try 2).

6- We are almost done. Now go to Edit, Fill,
Black. (no link here)

7- And the finished product. Click to enlarge.

Obviously this didn't take very long to do, but you get the idea.
After you get this down pat, try throwing around a few variables. Maybe
do the same thing AGAIN on top of this image and turn the frame into a
border that is rough on BOTH sides. Maybe even texture the border. Have
fun!