To include an image for each result simply return the [ImageUrl] column with the path to the image.

'~/images/grid/WindowsServer.png' AS [ImageUrl]

For an item you can return the image for that item by calling the GetTypeNameInternal

dbo.GetImageForType([ItemCore].[Type]) AS [ImageUrl]

When the display each result in a new table output and charting setting is enabled for the report the image will be displayed in the title of the result.