Let the vanilla ice cream sit out for a few minutes to soften.
Add to a large bowl.
Fold in the food coloring gel until the ice cream is uniformly blue.
Fold in the cookies.
Transfer back to the ice cream carton or another freezer-safe container.
Freeze until firm enough to scoop, about 2 hours.
Notes
Ice Cream - Choose a vanilla ice cream with a strong vanilla flavor for the best results. We actually use Great Value brand vanilla bean ice cream from Wal-mart and it works really well in this.