Place walnuts in a bowl and fill with enough water to cover by 1 inch. Cover and set aside at room temperature to soak at least 1 hour to 12 hours. Drain walnuts and rinse thoroughly. Combine walnuts, second water, honey, vanilla, and salt in blender then blend on low until very smooth.
Add avocado, spinach, and grapes in blender and puree until it has a smooth and creamy consistency.Pour smoothie in a bowl, top with sliced kiwi, strawberries, oats and walnuts. Enjoy!