Think of something interesting for a graphic image.
Clear it with the instructor, and do it.
It should have some complexity to it.  It might take several processes,
a number of steps, it might include a number of unique graphic items or
something else.
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For example you may have an image that uses a number of different techniques.
A rough measure, for this type of work, is 5 to 8 different graphic techniques.
You can use any tools you want, but you then still need to do something
interesting with those resources.
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You must turn in a description of the work.
This is to specify the interesting items from the point of view of 
computer graphics.  That is, it is not as important what an image
if of, but instead the tools, techniques used to create the image.