Mike Martel

This plugin is tested only with BP 1.6.2 and WordPress 3.5, and is not meant to be backwards compatible! If you’re running an older version of WordPress, use Vernon’s original plugin <a href="https://wordpress.org/extend/plugins/buddypress-default-group-avatar/" rel="ugc">BuddyPress Group Default Avatar</a>
Allows specifying the URL of an image to use as the BuddyPress default group avatar. This makes it easy to distinguish groups from members who are using the mystery man default user avatar.
It works in all situations (activity stream, groups, forums, directory, etc). Upload your image to somewhere within your theme and drop the full URL in the options screen.
If you had <a href="https://wordpress.org/extend/plugins/buddypress-default-group-avatar/" rel="ugc">BuddyPress Group Default Avatar</a> previously installed, this plugin will use the avatar set in that plugin. Otherwise it’s bundled with a default avatar for groups (see screenshots).
Not tested on multisite/network install yet (please confirm if it’s working!).

BuddyPress Default Group Avatar

Adds a default group avatar to BuddyPress without disabling Gravatars for users.

AboZain Albanna

Rename Default Post is a simple plugin gives you the ability to Rename your Default Post label to custom name in admin menu. 
Why would I leave my client a menu item that says ?Posts? when they are adding news updates, or portfolio items, 
 So you can simply use this plugin.
<h3>For Example Change Posts to News</h3>
How the plugin works: = 
Go to Settings -> Rename default post.

Rename default post Labels

Awesome

A simple, lightweight WordPress plugin Rename your Default Post labels to custom name in admin menu

BuddyPress Default Group Avatar vs Rename default post Labels