Here are several transparent gifs. Make sure they stay transparent. Please create a folder some where on your hard disk and download these images to that folder.

Your spaceship:

Your weapons:

 
    Missile

 
    Cannon

Your enemy:

His or her weapon:

and an explosion:

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Now, open up Paint Shop Pro and personalize these images. Do not change the names of these images or their format. I would suggest that you leave the relative sizes the same. But you can try any thing that you like. There'll just be no guarantee that it will work.

When you have finished doodling, create another folder and put this zip file in it: INVADERS 
Extract the files into the folder.
Now carefully replace the images with those that you have created. Have fun.