This is an assignment I gave to my students the week before Valentine´s Day due on Feb 14th. They had to create a (rhyming) poem in Spanish about something they loved. I chose sushi for my example because I love sushi <3. The poem I wrote for an example is included.
I found a list of "expresiones románticas" online and gave them to the students with this paper for help. We didn't spend much time going over the expressions, they were fun, and students quickly picked up on the meanings. I would choose something simple and straight forward.
They read them to each other and had a fantastic time.
There is a lot more you can do with this idea if you have the time!