Wrote a scraper for stock prices, what do I do with the data?

So, as a side project, I wrote a scraper in nodejs to scrape for stock price information for all companies on the stock market. Now, I have a wealth of stock price information.

My original plan was to write a simple moving average analyzer that tells me when averages cross above or below each other.

What else could I do with this data? Any interesting analytics I could do? Just curious to see what other hackers might do with this information.