If you have reseller or higher access on the server, you can do some substantial customization of the appearance of cPanel. Of course, you can change the logo. Just go to cPanel -> Preferences -> Branding Editor and click on the "Edit this style" button for style you wish to edit.
On that page, click "Edit Logos" to be brought to the page where you can just upload and place the logo as you desire.
We're actually doing a couple of presentations at this year's cPanel conference on this. You can find more information about the conference at:
http://conference.cPanel.net
We do have some introductory material in the "Customizing cPanel" presentation from last year's conference, available at:
http://www.cpanel.net/docs/seminar07/Customizing_cPanel.pdf
Thanks for the quick reply. However, my problem is I want to change the logo for each account separately, e.g. I am a reseller and I can put my logo but my clients want to have their own logo instead of mine. Can I allow them to replace my logo with their own.
Not without creating a custom theme and performing substantial modifications to that custom theme.
