Sometimes after an unpleasant work meeting or something they find me as, tired and grumpy, I'm leaving my building. They never fail to make me laugh, and to turn around my mood.
I've never received trinkets from crows, but they've still given me more than I've given them.
@ct_bergstrom I once received a dried stalk of grass that had gone to seed as a gift. The crow insisted that I take it.