That's the NaPoWriMo challenge. April is National Poetry Month and I gave this assignment to my Poetry-Writing students. I always do the assignments with them and decided to keep mine in my daily journal.
As a help, ReadWritePoem is posting daily prompts. On the first day we had to use a metaphor.
I tried this challenge last year and found it very difficult and swore I'd never do it again, but...I'm just a glutton for punishment, I guess!