Salvaging Bigby's Guide to Giants for the Mystara setting
by Marc SaindonI mean aside for the obvious (making giants a core part of Norwold and the Northern Reaches, and formorians part of the Isle of Dawn), how would you integrate giants in the Known World as a central plot point campaign (that isn't 'Against the Giants')?
Atruaghin Clans might fear the Stone Coat Giants
Native American Legends: Stonecoat (Stone Coats)
The tale of Puss in Boots features a Giant's castle, so that might be part of Darokin (also see the italian Brancalonia rpg for inspiration)