In a Sharepoint Portal (SPS) we cannot apply a theme to change the “looks” of the Portal like we have in WSS, an option of administration. But it is still possible to apply a different theme to a SPS Portal, how can we do it?
1 – We need to get a Theme to apply.
In the Sharepoint Server:
You can find the available Themes for Sharepoint at “C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\60\TEMPLATE\THEMES”. You can also download themes from the internet.
Choose the Theme.CSS of the chosen Theme and place it in “C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\60\TEMPLATE\LAYOUTS\2070”
1 – Site definitions
2 – Change portal site properties and site creation definitions
3 – personalized CSS “_layouts\2070\theme.css”
That should do the trick!
Warning: the use of a theme might not reflect on all pages of the portal.