In Christianity Rediscovered: A Taxonomy for Proverbs, I try to categorize the wisdom of Proverbs so that we can retrieve it quickly and to study it with greater scope and depth.
I have done once with Righteousness in The Righteous - Wisdom from Proverbs.
Here is one study on Cause and Effect, or the Law of Harvests- Sowing and Reaping.
Just in case some Christians think that Proverbs is OT and not NT and hence is not relevant to them, I include the NT references on the same subject.
Here is the mind-map: