I love the effects of light on water. Here's a minimalistic wallpaper from Taylor Creek in Zion National Park with the light reflecting on water over pebbles.
We visited the famous Crescent Meadow at Sequoia National Park just as the sun was coming over the tall trees to light up the green grass. Here is a stunning high contrast photo with the shaded forest and the sun streaming into the meadow.
Here is another spectacular view from the White Rim Trail in Canyonlands National Park. At the White Rim Overlook, there's beautiful red and orange rock as far as the eye can see, contrasted by the blue sky.