Since each website has different features and functionalities, there are no whole templates available.
If you already have a live website or know of one that you like the style of, it is possible to use a Live Web View component to view the site within a design. You can then place components on top of the Live Web View and recreate the layout. There is a blog post that covers this workflow that can found here: Add Live Views to Your Wireframes & Prototypes
. In the post and video it refers to the iFrame component which was renamed to the current name of Live Web View.
Currently, the only way to transfer data between two accounts is to copy and paste components. While you can import Templates, Masters and Assets from the Library tab under the Folder menu, this is only for other projects on your account. There have been some plans for users to create open libraries of their wireframes, but it is not currently on the roadmap.