First you need to install the emerald theme manager in Ubuntu 10.04.After installing emerald theme manager you can install themes(which is available free and available for download) for different windows effect from the given download links-
Download Emerald themes
How to Install Emerald Themes in Ubuntu 10.04
#1. Open emerald theme manager from System->Preferences->Emerald Theme Manager.
#2. Now click on import and browse to the directory where you have saved the themes(download link is given above) and click on Open.
#3. Then select the Theme and change the windows effects.(If emerald is not running then run emerald –replace command in ubuntu terminal).
Install Emerald Theme Manager in Ubuntu 10.04
Emerald is a decorator(with 3D effect) for windows managers like Compiz-Fusion(plus themer application).For 3D cool desktop effects compiz and ccsm is should be installed on Ubuntu 10.04 .First install compiz(for 3D desktop Effects) on ubuntu 10.04 ,Then Emerald can be easily installed from command line or by using synaptic package Manager.
Emerald for Ubuntu 10.04(lucid Lynx)/9.10/10.10
Using Synaptic Package Manager
#1. Open Synaptic Package Manager(System->Administration->SPM).
#2. Search for “emerald” and mark the first result to install.
#3. Then click on Apply to install emerald and wait for the installation to complete(It will take less than a minute).
#4. That’s All..
Install emerald from command line
Type the following command in the ubuntu terminal
sudo apt-get install emerald
Run Emerald in Ubuntu 10.04
Type the following command(s) in command line/shell/terminal