Use to sprinkle on anything that you think needs a hint of sweet crunch: ice cream, puddings, pie with whipped cream toppings, etc. From "Jeni's Splendid Ice Cream Desserts," by Jeni Britton Bauer.
Combine the graham cracker crumbs, flour, cornstarch, sugar and salt in a small bowl. Add the butter and stir until large lumps form and all the dry ingredients are moistened (it should look like lumpy wet sand). Pour the crumbs onto a baking sheet and spread evenly.
Bake the crumbs for 10 minutes. Remove from the oven and toss the crumbs with two bench scrapers or metal spatulas, then chop into 1/8- to 1/4-inch pieces.
Return to oven and bake 10 minutes longer, or until gravel is a rich brown. Remove from oven and cool. Store in airtight container for several days or freeze for longer storage.