The Open Borders folks are offering $200 to anybody who comes up with a simple logo that could be easily reproduced on a white sheet to express the essence of their movement.
I came up with a quite simple logo yesterday, but one of my anonymous commenters tops that with the perfect suggestion: an image with a universal message yet won't tax the artistic talents of even the most talentless Open Borders fanatic: don't put anything on the white sheet.
An example in action:
If you want to get fancy, you can trim your white flag into the shape of the contiguous 48 states of the USA:
But, why bother?
As a palate-cleanser, here's Black Flag performing their early 1980s song about the effects of opening borders (lyrics here):