This is a quick and dirty solution to change the banner in LaunchPad.
Do not forget to backup the files before any change. See SAP note 1659690 for a better solution.
- Stop Tomcat.
- Replace the file C:\Program Files (x86)\SAP BusinessObjects\tomcat\webapps\BOE\WEB-INF\eclipse\plugins\webpath.InfoView\web\images\SAP_logo_reg.png with desired logo (preferred dimensions: 63 x 31 px).
- Delete all folders under C:\Program Files (x86)\SAP BusinessObjects\tomcat\work\Catalina\localhost
- Start Tomcat.
- The users will need to delete temporary files in browser to see the change. In IE, Tools > Internet Options > General, Delete under Browsing history: