Watchlion helps you to keep some contacts private. All SMS message and call log will hide from the android system.

A task manager application which monitors running processess and their memory usage. Allows killing of selected processes and remembers previously killed processes.

One-stop task manager. Monitor and kill task, speed up phone, and save battery.

1*1widget to monitor memory usage.
search&sort task by name.
auto-kill task when screen off.
ignore app when kill.
vivid online help.

There are many applications that automatically start when you turn on your device; many of these you don't use or need, they just consume your valuable resources. Autorun Killer lets you manage applications that start up when you boot your device. Donate version even tries to prevent their restart (and is ad-free).

2x2 Home screen clock widget displays time in a grid.
Features: Customizable color themes, Time or date display, Time zone selection, Tap for Configuration, Change size within the 2x2 space.

This is a wallpaper changer.

15 high quality fractal wallpapers.

Customizable auto-changer.

PLEASE ADD EXCEPTION TO TASK KILLERS.

Randomize option.

Visit website (below comments) for additional details and screen-shots.
http://www.philsfractals.com/android.php

Taskiller is an utility to close your apps in background in one click.