1.) An analysis of amateur historical event movies that people post on youtube; would probably have to narrow to a specific event.
2.) A study of how quickly inaccurate historical data is edited on Wikipedia, with attention paid to what types of information and types of articles are policed more rapidly.
3.) Something involving historypin and American University Archives collections.
4.) An analysis of certain word groupings and their frequency of use over time on google Ngrams.
5.) Last and my favorite thus far: Write a blog that helps the non history-major recognize historical data through visual cues. For example, a series of posts could focus on how to date a building based on architectural features. Another could focus on dating a movie or portrait by costuming choices.