Report should be available only to CEO, for others it should be hide, how can we do it?

For a specific Report:
* Specific Report can be controlled by creating a custom report folder and assigning just the CEO as a viewer of this folder. All reports in the folder will be visible to the CEO only in that scenario.
* Observe below screen shots:

 For the Reports Tab:
* Reports Tab can be controlled by the User Profile

Adding a custom button to page layout

* Go to Object detail page> Go to Custom buttons and links section > create a custom button
* After creating custom button Go to page layout of the object> there you can find buttons and links option> click on that and drag to custom buttons and links area

Is it possible to refer static resources files in formula fields

Unfortunately, it does not. The reason is that static resources cannot be referenced in formula fields.

But no big deal, because each static resource gets its own unique URL. So you could go to your static resource and click ‘Click here to view this file’ 
 
Refer:
http://improveit360.blogspot.in/2010/09/how-to-use-static-resource-images-in.html