This long-running series is currently open to submissions for various anthologies. Take a look at the themes here. You can find guidelines here on what the editors are seeking. Both stories and poems are accepted.
The Chicken Soup for the Soul feel-good publishers have a lot of submissions opportunities on their website. If you read carefully, you will see that poems are invited for most (if not all) of the anthologies listed. Check out the relevant page for full details: http://www.chickensoup.com/story-submissions/possible-book-topics