Found this cool website today. WordPress Theme Detector
It has four main functions:
- Find out what theme a website is using
- See a list of websites using the same theme
- Find out what plugins a website is using
- List of WordPress hosts
This would be a good idea generator if you were thinking of using a particular theme. For instance if you were thinking about using the Executive Pro theme by Studio Press. Browsing the 8,877 websites using the Executive Pro Theme on WordPress Theme Detector would give you ideas for your design.