When I am looking for inspiration I like to have examples of various design techniques and color palettes.  The best way that I have found to do this is to have a variety of different design gallery sites to peruse.  Even if the client has provided you with their vision of the site it can be advantageous to look at other types of sites and see if there is some technique that could be useful on your site.  After all, good designs incorporate current styles while providing a unique and memorable experience.  Here are the main design galleries that I visit.