How can I get rid of the white border around picture icons in Finder window

*I like it this way. This would especially come in handy when I am looking for unclean edges, which I can do in the Finder window by changing the background to black.*

*I don't know when this happened, I just hadn't needed to notice it before, but now I can see there are white photo style borders around new pictures.*

*See with the black background, I can no longer clearly view the edges.*

*I just want to be able to turn this white border off, so I can see these photos against the black background. Some of my older folders still show photos this way. I have looked at preferences, Item info, view options, and I can't see anyway to turn it off, or for the folders that have none, to turn it on.*
*Here is a folder that has both kinds!!*

*Can anyone help me!?*
2008 MBP 2.4ghz 4GB Ram / 2008 MP 8-core 2.8ghz 14GB Ram, Mac OS X (10.5.5)