Seeing oneself pray while in a state of major ritual impurity signifies setting out on a journey for worship. Being in that state and unable to find water for washing signifies difficulty in worldly and religious matters one wishes to accomplish.
Finding water and washing after such impurity signifies release from grief and sorrow.
Ibn Sirin says seeing semen signifies wealth and blessing; seeing it in a vessel signifies benefit coming from property.
Ja'far al-Sadiq says major ritual impurity is interpreted in three ways: children, wealth, and loss of wealth.