Customizing Logo in Hyperion

For HSS:

Navigate to below given directories and change logon_panel.gif

• \bpmstatic\themes\theme_tadpole\images_global
• \bpmui_WAR\bpmstatic\themes\theme_fusionfx\images_global
• \bpmstatic\themes\theme_tadpole_hc\images_global

For Workspace:

Navigate to below given directories and change

• <HYPERION_HOME>\common\epmstatic\bpmui\themes\theme_fusionfx\images_global
• <HYPERION_HOME>\common\epmstatic\bpmui\themes\theme_tadpole_hc\images_global
• <HYPERION_HOME>\common\epmstatic\bpmui\themes\theme_tadpole\images_global

For Planning:

Navigate to below given directories and change logon_panel.gif

• \ui_themes\tadpole\images_global
• \ui_themes\tadpole_hc\images_global

HSS Splash image:

Navigate to the below given directory and change Shared Services_Splash.gif

• \cas\Shared Services_Splash.gi

Workspace Splash image:

Navigate to the below given directory and change SplashScreenSystem9BIPlus.gif.

• <HYPERION_HOME>\common\epmstatic\wspace\images\SplashScreenSystem9BIPlus.gif

Reference: 

http://www.orahyplabs.com/2012/01/customizing-epm-workspace-1112.html#.UD2n-KMg7cc