This idea is based on the notion that workers will remember an image better than an mturk requester or type of HIT. You'll set up a survey with an image that will redirect people to another survey. This is imperfect, but it has the added bonus of being able to redirect to any survey you would like. This method relies on appending an embedded data value to the survey url -- for more information on this, see http://www.qualtrics.com/university/researchsuite/append-information-to-the-url

To do this, first create a new survey in Qualtrics. This survey only needs one block, and does not need to have an actual question. The block should have an image (it doesn't matter what the image is, so long as it is distinctive and recognizable) and some text saying something along the lines of "If you recognize this image, please do not take this survey." 

Next, go into the survey flow.  The first thing you will want to do is add an embedded data block right at the very top with a single embedded data field. You can name the embedded data field anything you'd like, but it will be the variable that controls what survey people are sent to after clicking through your image survey (see screenshot below).

Next, for every value you want the embedded data field to have (with each value representing a separate survey you want to redirect to), create a conditional branch where the condition specifies what to do if the embedded data field is equal to that value (again, see screenshot). 

 

Under each branch, add an end of survey element, and hit the customize button. Select the "redirect to a URL" option, and paste the URL to the survey you want people to take into the box. See the screenshot below. Do this for every individual survey you want to use this particular image.

You can't pay someone directly, and so you can create a HIT with zero reward, and then bonus somebody who you want to compensate.