F.B.
I usually give something consumable, and a gift to a charity, which is either dear to me, or somehow topically related.
in this case - a bottle of wine, a bag of coffee beans, a few bars of soap, a box of cookies, a carrot cake, a card and a thank you advising a small gift has been made to - the march of dimes, the smile fund, st jude's children's research hospital, unicef, heifer international etc.
if someone dog sits for me, I give a gift to the ASPCA.
if someone puts on a bbq, I might give a gift to the fresh air fund, to city harvest or something of that ilk.
if someone waters my garden while I am on vacation, I might get them a pot of herbs and a donation to the arbor day society, or farm aid, or 4H.
Best,
F. B.