considering you are replying to a 8 month old post, i think this was resolved 6 months ago, but im sure somebody can use the suggestion you provided.
For those people looking for real help on changing this then here it is
If you want to get rid of that nasty pink color from your upload pages then just edit your
swf_upload_integration.html file found in /templates/base
Do a search for
<div id="accepted_files_block" style="width: 800px; background-color:#ffdada;"></div>
Then enter any color code you like in place of #ffdada
Then go to inc/classes and edit BxDolFilesUploader
Do the same search as above looking for
<div id="accepted_files_block" style="width: 800px; background-color:#ffdada;"></div>
Then change #ffdada to the same color you used on swf_upload_integration.html
It's really just that simple. I have no idea why all these people have to make it so difficult to do one simple task.