How is this for a subtle look? It is called Frosted Window and the tutorial is available at Splitcoaststampers.
Just take a piece of white cardstock and a piece of vellum paper. Stamp the same image on both. Colour the cardstock image with very bright colours, and then colour the back of the vellum image with more muted colours. Join the two pieces with dimensionals and add a frame. Result, a perfect frosted window.
Cardstock: Daffodil Delight, Early Espresso, Whisper White, Vellum Paper
Ink: Early Espresso, Chocolate Chip, Crumb Cake, Old Olive, River Rock, Marina Mist, Baja Breeze
Stamps: Easy Events
Accessories: Stripes EF, Perfect Polka Dots EF, Dimensionals
Technique: Frosted Window