There are a lot of sites with free templates for homepages. These are often too simple for web applications, which have sometimes a lot of deeper nested content.
For example. An application view which displays a list of customers. One customer is "expanded" (details are visible). Inside of this details, there is a list of notes. Each note contains action-elements like delete or edit. And even this example is very simple. Sometimes the custormer list needs grouping boxes.
This requires more boxes or more colors, which is very difficult.
Are there any templates for web applications with deeply nested content?