Do you have a special page dedicated to monthly giving on your website? If not, consider creating one. Since building monthly giving has one of the biggest payoffs for charities, a page just for this program seems like a no-brainer.
Here are several monthly giving pages that stand out, starting with the National Audubon Society. The image says it all, so the words can be short. The visual impact of this page will likely send any bird-lover over the moon.
An infographic showing the impact of your donor's gift can work wonders for a monthly giving page. Take note of how Feeding America does it. You don't need a huge infographic with dozens of data points.