Right, so I saw this technique on Pinterest, and thought it would work well with scenics. The original of the pin is here, on a blog called Stamping To Share. Haven't used my Stampscapes much lately, so out they came. 
The blog owner, Kay, has done a video on there, using the Stampin Up set Lovely as a Tree- here's my pic by pic post with the Stampscapes.
First off, I cut two Nestie shapes, using the 2nd largest die of labels 8.
I also cut two from Classic Scalloped Rectangles, but I haven't used them yet. You can also see the inks I used at the back, the stamps and some sponge pieces.
Taking the lightest colour, here Distress Inks Mustard Seed, swipe lines across the label, the full width.
Swap to your second colour, I used Tumbled Glass, and swipe alongside the yellow. Let them overlap a little so the blue will blend with it in places, making green.
Now bring in a third, darker colour- I used Dusty Concord DI, filling in the spaces, and lightly swiping over the other colours to tone them down a bit.
The stamp I chose for this one is called Lakeside Cove, and I stamped it in Staz-On Black, as I wanted to add some more ink yet, and didn't want to risk Versafine smudging if it wasn't dry enough.
In Kays version, she sponged Dark Blue over the ground area after she'd stamped, so you didn't see the continuation of the streaks. As my image had water in the foreground I just wanted to tone the colours down a little, so they would appear to be reflected in the water.
To do this I used Adirondack Sailboat Blue and Denim sponged over the water area- toning down the colours reflected in the water also had the effect of making the sky seem more vibrant.
Final ink was some Adirondack Mushroom on the rocks- again just to merge the colours in, rather than cover them up.
I repeated the technique on the second label, adding Adirondack Citrus to the mix this time, and using a stamp called Rocky Creek.
Again I used the Blue Adirondacks to tone the colours down in the water, and Latte and Mushroom on the rocks.
I also felt the label size was a bit too big for the image, so cut them both down using the next size down Nestie.
I added some stars in the sky, and reflected in the water, with a white gel pen.
I used the second largest die to cut out some black card to matt them onto. I cut two card blanks to roughly 6" x 5". Two strips of card, one gold, one silver were embossed with Cuttlebug folders, the gold with Diamonds in the Rough, the silver with Forest Branches,and the strip of card added to the card front using DST. I added the image on top with more DST.
Supplies: Dye inkpads in Yellow, blues, brown and purple.
White card
Stampscapes or other scenic stamp
Sponges
Staz-on Black
Nesties label die
Embossing folder of choice.
White gel pen.
This was my desk mid- session, lol.
