Ghost Line: Use the following line as the first line of your poem. When you are done, cross out that first line you were given. Now the first line you wrote is the first line of your poem!
After searching for so long, I found it.
Ekphrastic Poem: An ekphrastic poem is written about, or in response to, a particular scene or piece of art. Look at some visual art that strikes you, and see what comes to mind! Research some existing ekphrastic poems as examples. Here is the website for Stephanie Chang, a friend of mine & a great photographer whose art you should most definitely check out: https://stephaniechangphotography.com/
Your Favorite Song: Choose your favorite song (or any song you enjoy!). Write down 6 words from that song of your choosing. Incorporate those 6 words into a poem. Bonus: Title your poem after the 6th line of the song!
Make Your Own Art: You're at a fictional art museum (me naming one might sway your imagination. Go in with a clean slate!). You're pondering a particularly gripping painting. Describe that painting. Let your mind wander!
Unnamed Subject: Write about an object, write to an object, write from an object's perspective. But don't name the object! See if your readers or fellow workshop writers can guess what it is.
Variations of some of these prompts were inspired by those from a fabulous poet, Ollie Shminkey.