The role that you are recruiting for may require a certain level of innovation and creativity. Interview tasks or activities are a great way to show a candidate's ability to come up with ideas and solutions in a short amount of time.
The most successful marketers are idea-savvy problem-solvers, so if you are hiring for a marketing position, you could share past campaigns that didn't work out and ask the candidate to suggest revisions to the campaign. Or, have the candidate take 10 to 15 minutes to review the company's social media and come up with suggestions for growth. These activities won't show the candidate's most polished work, but they will indicate how the candidate responds to pressure and their ability to problem-solve.