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I have an application that is based on Codeigniter. It has a template framework so that you can create a custom design for the UI. I would like to create a new template based on the old one. You would take an Admin theme similar to http://themeforest.net/item/simpla-admin-flexible-user-friendly-admin-skin/46073?WT.ac=category_thumb&WT.seg_1=category_thumb&WT.z_author=ponjoh
Those are just examples and may not be used. You would have to take the admin theme and incorporate it into the application framework.
Since the application was designed with templates in mind, it will be a little easier to restyle.
Also, some other css changes will be needed along with some application changes and probably some added functionality.
I estimate that it will take less than 1 week for the restyling and then another 3 or 4 days for the enhanced functionality that I would like to add.
I can provide a zip with the current template to give you an idea of what files you will be changing, but since this is proprietary software, I can't show all the files except for an example.