Bear in mind that in ancient Abrahamic myth, rain (say) doesn't just happen -- it's
created. The idea of a deity being a watch-maker who sets machinery in motion came much later, in the Enlightenment. So when angels are changing the weather or conjuring food etc... they may well be creating -- albeit on God's behalf.
There's one angel that bears special mentioning here too -- the angel Metatron. In ancient Jewish myth, Metatron is the most favoured of all angels -- a celestial scribe known as "Lesser YHVH", who in some accounts has dominion over the earth, and is in charge of its 'sustenance'. According to myth the rabbi
Elisha ben Abuyah mistook Metatron for being a second authority in the universe, and got in trouble for that -- because Metatron was a servant, not a master.
The important function of angels is of course their message-carrying (the Greek root
angelos means "a messenger"), but the god Hermes was a message-carrier too. So what's the difference between Hermes and Metatron, say? I think that it comes down to that master/servant relationship. Hermes defers to Zeus on occasion, but has no master. He's his own moral authority. Hermes is the ultimate inspiration and final refuge of boundaries and the travelers who cross them, of shepherds and cowherds, of thieves and road travelers, of orators and wit, of literature and poets, of athletics, of weights and measures, of inventors, of general commerce, and of thieves and liars. Hermes has supreme moral authority over his domain.
As a supreme moral authority Hermes happens to have a creative power (Hermes created fire, for instance), but I'd argue that the power derives from Hermes' moral authority, and not the reverse. Shiva, who leaves the creating to
Brahma, still has uncontestable moral authority over destruction and change. Like Hermes, Shiva has no master.