Heys Lisa - definately use any biscuit dough! As long as it dries out ok it'll be fine. Royal icing is used to hold the whole thing together - just google martha stewart or better homes & gardens if you want some recipes.
You can also make the dough without the ginger. The original "gingerbread" house wasn't actually made with ginger!!! It has the following ground spices: cloves, cinnamon, nutmeg, pimento (called "Allspice" in Australia), and cardamom. Oh, and more cinnamon!! So just google the recipe, use all these spices instead of ginger and it will taste great!!
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