The concept of gargoyles for home protection comes from medieval Europe and was designed as statutes looking down from cathedrals and churches. The myth of the gargoyle is it offers protection against evil, even if some of the early ones looked evil. Today they are used as garden statutes giving your garden an ancient look giving your visitors a scare, amusement, or surprise.
You still can buy concrete statutes, however, they come in reinforced fiberglass, making them much cheaper than the concrete counterparts. There are many types of gargoyles with their own history, making them collectible for garden spaces.
I leave the gargoyles out in the garden year-round, giving a look of permanence thru the seasons. The ancient gargoyles give a look of the past and the more modern ones advance it to the present.