title: What are some compact algorithms for generating interesting time series data?
body: <p>The question sort of says it all.</p>
  
  <p>Whether it's for code testing purposes, or you're modeling a real-world process, or you're trying to impress a loved one, what are some algorithms that folks use to generate interesting time series data? Are there any good resources out there with a consolidated list? No constraints on values (except plus or minus infinity) or dimensions, but I'm looking for examples that people have found useful or exciting in practice. </p>
  
  <p>Bonus points for parsimonious and readable code samples. </p>