How to create a custom Popup form in Excel

Hi,
I am doing some work with Excel. I am not much familiar with VB but the Excel macro seems easy and interesting. I have yet used MsgBox and buttons to do almost everything. The Excel sheet was the main window which is used as a form for hosting the other stuffs.
For example if i need 3 data to input I use something like
x = InputBox("enter the value", "Its the title")
3 times.
Now I think it would be cool to have my custom popup messages/forms for doing all these. But how do I do this? Please help.
