Just a couple of Basecamp themes I’ve put together.

Header Background: #72AA1D
Project Name: #fff
Client Name: #000
Current Tab Text: #000
Tab Background: #B8D48E
Tab Text: #000
Tab Hover Background: #FFCC00
Tab Hover Text: #000
Links: #8C8C8C

Header Background: #7B007B
Project Name: #FFD52C
Client Name: #fff
Current Tab Text: #7B007B
Tab Background: #B340B3
Tab Text: #fff
Tab Hover Background: #990099
Tab Hover Text: #FFD52C
Links: #03c