Here's an attention-grabber: an actual-size Luther. Hang him on the wall, or glue him to some cardboard and make a cutout. If you don't have a big color printer, don't worry. You can upload this standup Luther banner to any Walgreens photo center—and it fits their 2foot x 6foot banner template perfectly.
(No we don't get a commission from Walgreens. But they do have the lowest-cost banner printing we could find)