Preheat the oven to 350°F (177°C) and line 2 large cookie sheets with parchment paper.
Mix the cookie mix, egg, melted butter, and blue food coloring in a large bowl until a thick, blue dough forms. Add more coloring, if needed, until the dough reaches your desired color.
Fold in the white chocolate chips, semi sweet chocolate chips, crushed Oreos, and chocolate chip cookies.
Stir the dough well so that the add-ins are evenly distributed throughout the dough. Use your clean hands to knead the dough a few times so that everything is well dispersed.
Using a 1 ½ inch cookie scoop, scoop out dough balls and place them on the prepared cookie sheets.
Add extra chips, cookie pieces, and candy eyes if desired, and then bake for 7-11 minutes or until the cookies are set but still soft and the edges are just beginning to brown.
Allow to cool for at least 5 minutes before removing from the cookie sheet.
Serve warm or at room temperature.