With SAP GUI for Windows Version 7.10 Patch 11 the new design theme Signature will be available. It does harmonize the User Interfaces of SAP various products. (SAP Signature Design)
Unfortunatelly Patch 11 of SAP GUI isnt yet available, but this doesnt mean you cant get the new theme right now. All you need is a GUI 7.10 and the Netweaver Business Client (NWBC).
Logon to your SAP System via the NWBC.
Open an application (e.g. the Object Navigator)
Now create a new session
… hello Signature!