Below links will help you in customizing your Oracle EPM Products, provided you need to check the licensing part before you attempt to implement this in a production environment, for testing and personal use you can try this out.
how to change the logon images in EPM system --> http://www.orahyplabs.com/2012/01/customizing-epm-workspace-1112.html#.Ux1Nsz-Sz7w
How to change the heading text that appears in the top bar of the browser? --> http://www.orahyplabs.com/2012/06/customizing-epm-workspace-1112-part-ii.html#.Ux1Okz-Sz7w
How to increase the number of items showing up in Quick Links of Workspace Home Page? --> http://www.orahyplabs.com/2013/05/customizing-epm-workspace-1112x-part-iii.html#.Ux1O8z-Sz7w
Becarful while applying the above customizations and you should be aware of fully what you are doing...
Happy Customization....
how to change the logon images in EPM system --> http://www.orahyplabs.com/2012/01/customizing-epm-workspace-1112.html#.Ux1Nsz-Sz7w
How to change the heading text that appears in the top bar of the browser? --> http://www.orahyplabs.com/2012/06/customizing-epm-workspace-1112-part-ii.html#.Ux1Okz-Sz7w
How to increase the number of items showing up in Quick Links of Workspace Home Page? --> http://www.orahyplabs.com/2013/05/customizing-epm-workspace-1112x-part-iii.html#.Ux1O8z-Sz7w
Becarful while applying the above customizations and you should be aware of fully what you are doing...
Happy Customization....