Pitch:

My data visualization will be a graph of women’s wages compared to men’s wages across a time period of the past few decades. It would incorporate a timeline. Using a colorful visualization of this data will make the info attention-grabbing and make the gender wage gap easier to understand for viewers who visit my site. Inspiration: http://www.aauw.org/2016/02/08/pay-gap-especially-harmful-for-black-and-hispanic-women-struggling-with-student-debt/

Another option would be to use an interactive map of the United States much like this one: https://blog.dol.gov/2015/10/20/high-cost-of-unequal-pay/