Here's a technique called "Gradient Sponging" from the June/July 2014 issue of Technique Junkies.
Top layer: Festive Berries
2nd layer: Ripe Persimmon
3rd layer: Spiced Marmelade
4th layer: Mustard Seed
Bottom layer: Squeezed Lemonade
Paper: Real Red, Basic Black, Whisper White (Stampin Up!)
Stamps: Sweet n Sassy (Landscape Silhouettes), Technique Tuesday (Classic Ali Edwards)