Nashita

Simple and clean styling widget for displaying latest posts with thumbnail.
After installed the plugin, WP Latest Posts Widget will be in <code>Available Widgets</code> section named <code>Latest Posts</code>.
Optional settings for <code>Title</code> and <code>Number of Posts</code>.

WP Latest Posts Widget

Widget for displaying latest posts with thumbnail

roganty

Set a default thumbnail using either an image from your image gallery or use your gravatar for posts with no thumbnail set.
This plugin requires your theme to have support for post thumbnails enabled. 
Although no extra code needs to be added to your theme, some alterations might be required for trouble free usage.

Default Post Thumbnail Image

Set a default thumbnail using an image from your gallery or use your gravatar for posts with no thumbnail set

WP Latest Posts Widget vs Default Post Thumbnail Image