Teaching Tolerance has made its popular One World posters available as a free download. 35 different designs are available, one of which is shown below. All Teaching Tolerance programs and resources emphasize social justice, anti-bias, and learning to challenge prejudice and be agents of change.
PDF link to download a high resolution version suitable for printing these 11" x 17" posters.
More about Teaching Tolerance and the free resources it has available.
You can participate in Teaching Tolerance's #USvsHate Challenge.