However, if you were afraid of a puzzle drought, no worries. You can also try to predict commodity prices. From a recent New York Fed discussion:
[H]ave economists and analysts made any progress in their ability to predict movements in commodity prices? In this post, we find there is no easy answer. (...) [T]he results warn against interpreting current forecasts of commodity prices upswings as reliable and dependable signals of future inflationary pressure.(...)No easy generalization or pattern emerges, and the results look almost random. In fact, we are unable to generate forecasts that are, on average, more accurate and robust than those based on autoregressive or random walk specifications.