Eclipse : Please Help

Hello Everyone,
I'm new to the forum. Here is some quick background on my computer and programming experience to better help provide a solution.

Computer:
2010 13.3in MBP
OSX Mountain Lion
Running Eclipse (newest version)

Programming Experience:
Beginner. I took half of a semester of Python and I just started a Java class.

In my class we are always asked to exceed out program requirements. I have already done the program. It allows you to input 5 integers into dialog boxes. It uses if statements to tell you what the largest and smallest numbers are. It always tells you if the largest is divisible by the smallest. It displays all of the results into a single message box. That was the requirements. Done. I want to add color to my messagebox and the dialog boxes and I don't know how. My Java book is confusing me as to how to add color and the web searches I've done are fruitless. Could anyone help?

Question (restating it): I want to add color to the message box and the dialog boxes. How do I do it?

Thank you for reading. Any help is appreciated.

What GUI library are you using as this is critical towards helping find a solution? What have you tried to do to solve this? What specifically do you mean by adding color? Color where? What is a "messagebox"?

And most perplexing to me, what does this question have to do with Eclipse? Eclipse is just an IDE that allows you to create, compile and run Java programs, and should have little to do with the type of questions you're asking.

I'm sorry if this is in the wrong area. I'm new and I wasn't sure where to put it. I don't know what library I am using. Whatever is standard with Eclipse? I haven't tried anything because I haven't found a source that tells me how to accomplish it. Sorry - the actual code for what I termed a message box is:

JOptionPane.showMessageDialog

I want to make the box a different color than its default.

A good place to see what can be done with a class is to read the API docs for it. Here is a link:
Java Platform SE 7

Find the class in the lower left, click on it and the doc will be shown in the main frame.