I produced 2,000 "I Protested" stickers, modeled after the "I Voted" stickers, which have been shown to increase voter turnout. Perhaps these can increase protestor turnout one day. The only way to get one was by attending the 2017 Women's March against Trump in NYC or D.C., where I gave them out for free.
Soon after the march, Trump ordered a travel ban on Muslim countries, prompting a taxi strike at JFK Airport. When Uber undermined the strike by suspending surge pricing to JFK, people posted pics of their "Delete Uber" phone screens. But some people online didn't understand why, so I tweaked the "delete image" for people to share.