Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Henna in a dream indicates adornment in wealth and children. For men, it indicates concealment in matters. Dyeing the beard indicates following the Sunnah.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Henna indicates joy and happiness. Dyeing the hands and feet for a woman indicates her husband's good treatment of her.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Henna is interpreted as wealth and prestige. Whoever sees himself dyeing his hand will triumph over his enemy.