Preheat oven to 400 F
In a blender, combine flour, oats, brown sugar, salt, flax seeds, pecans and butter and blend until crumbly - careful not to over process!
Pour mixture into a 9X13 pan and bake for 15 minutes, or until golden brown on top.
Use a mixing spoon to stir the mixture until a nice crumble forms.
Remove half of the crumbs and set aside. Pat the remaining crumbs firmly into the bottom of the baking pan to form the bottom layer of crust and set aside until cool.
In a large bowl, combine peach ice cream and fresh peaches and stir
Pour ice cream mixture into completely cooled baking pan on top of crust.
Pour remaining crumble on top of ice cream and cover with foil
Place in freezer for at least 6 hours, or overnight if time permits.
Allow to sit out for 5 or so minutes before cutting and serving