Within the context of my own tradition, for the gods to bless something would mean one or more of:
Auspice and Synchronicity. For example, when Summer Solstice coincides with Full Moon, when Winter Solstice coincides with Dark Moon; these energies align with and correspond to each other, making the sacred day especially blessed or significant.
Invocation and Evocation. For example, pulling up the Earth Current and drawing down the Sky Current; calling upon a particular god or spirit to be present as an ally for ritual working or spellcraft within oneself (invocation) or in one's space (evocation).
Gratitude and Thanks. For example, blessing sleeping seeds at MidWinter or blessing the harvest at Autumn Equinox; an expression of gratitude for the workings of the gods continuing to flow in a way that sustains our lives.
Hope and Fortune. For example, may the Winds carry you onwards and the Sun warm your skin; words that aim to invoke the blessings of the gods for one's future good fortune and bring hope for that which is yet to come.
I might be missing some, but those are the main ones.