Display Lists and Libraries in sharepoint search refinements.

You can achieve this by editing the XSLT in Search Core Results web part.
Follow below steps,

• Open search site and search for some word.
• Once you see results on your search page.
• Edit the page.
• Now edit Refinement Panel -> Edit Web Part.
• Expand Refinement section.
• Copy XML from Filter Category Definition to XML editor.
• Add new category under <FilterCategories> section.
• Copy and Paste below section.

<Category    Title="Site"    Description="Which site this document is from" 

    Type="Microsoft.Office.Server.Search.WebControls.ManagedPropertyFilterGenerator"     

MetadataThreshold="5"    NumberOfFiltersToDisplay="4"    MaxNumberOfFilters="20"

     SortBy="Frequency"    SortByForMoreFilters="Name"    SortDirection="Descending" 

    SortDirectionForMoreFilters="Ascending"    ShowMoreLink="True"    MappedProperty="SiteName"

     MoreLinkText="show more"    LessLinkText="show fewer" />

• Copy new XML and update Web Part’s Filter Category Definition.
• Close the XSL Editor and save the webparts properties.
• Refresh the page to test it.