For this expressive exercise, go ahead and embrace your creativity and design anything that you might wish to share in your design portfolio.
It does not need to be restricted to graphic design. It could be hand-drawn, painted, music (such as mp4 file), photo that you captured, poem, story, creative coding, or even your resume. The only restriction is that you have to be the creator of it.
Store you creation in the Expressions Repository dropbox so that you'll be ready to include it in your portfolio in April.