I recently came across the tool Pablo by Buffer as a great way to create some really awesome communication graphics. While intended to be used for social media, I have found it a great resource for creating creative graphic slides for the message boards in our libraries. While the feature to add quotes easily from the bank of available quotes is awesome, I to find that the ability to add my own text is more valuable. The images are awesome and the search-ability make the tool really efficient. I have not only use this for our display screens but they make some great slides when inserted in a Google Slide presentation as well. Give it a try!