Source: The Great Interpretation of Dreams (Ibn Sirin)
Pebbles in a dream are money and dirhams. Collecting them indicates gathering money. They indicate hard-hearted men.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Pebbles indicate dispute and harsh speech. Walking on them indicates worry and grief.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Pebbles are interpreted as money. Whoever sees himself collecting them will gather money.