I want to use the Close button as it shown in WPF windows application into my application.
Is it possible to get the design/image from the existing resources? Anyone points to me to get Pressed, Normal and Hover icons for close?. I could not get them all in one place to match each other..
I have attached close button image here..

That part of the window, termed the chrome, is not rendered by the WPF framework. You can create a chromeless window and render you own chrome. There are quite a few articles / blogposts that describe this. For example:
http://blogs.msdn.com/b/wpfsdk/archive/2008/09/08/custom-window-chrome-in-wpf.aspx
If you just want the images, try a screen capture tool.