Use your understanding of hardware and software to build a small computer, or build a computer into something unexpected.
You will need to procure the necessary hardware and software, which means you'll either have to find components, or raise the money to buy them.
Check out the following links:
How would you procure the components needed to make these? Do you need to make, buy, or build something new? Perform a competitive analysis of the different options. Which of these offers the best performance, usability, or value?
Brainstorm creative concepts to make your computer unique. Could you build a computer that looks nothing like what you have on your desk? What problem could you solve with a mini computer? Where could you put a computer like this?