HOW-TO: Making an icon licking in Ubuntu

Hi all,
After a while of using Ubuntu, I feel that everything is fine and cool. It is still something missing in Windows. They are icons. This tutorial guides you how to make an icon licking in Ubuntu. I prefer to style of learning by doing, so let start with an example.
Let save the following code in a file named matlab.desktop, and move it to /usr/share/applications. It is a system folders, and you should know that we need to use sudo.

#!/usr/bin/env xdg-open

[Desktop Entry]

Type=Application

Icon=/usr/share/icons/matlab_logo.gif

Name=MATLAB R2012a

Comment=Start MATLAB - The Language of Technical Computing

Exec=matlab -desktop

Categories=Development;

All you need to do is to replace a command to start your application, in this case, it is MATLAB R2012a. It should be noticed that excutable command here is that matlab. We need to create alias for matlab.

 cd /usr/local/bin/ 

 sudo ln -s /usr/local/MATLAB/R2012a/bin/matlab matlab

This trick will allow you to start Matlab from any folder, as you were trying to do. Further, you should replace icon with your logo. That's all. Then, you find an icon of Matlab in /usr/share/applications. Now you can search Matlab in Launcher Utility and send this icon to Desktop to have a licking icon such that in Windows.

I know that I need to create some icons for some applications I like since a long  time ago. But I rely on the reason that I am busy so I did not care about it. Now I change. Let work with a style, live with a style and more,  research also with a style. I am gonna figure out what style I am.
Thanks,