Here's another card using the Brusho Crystal Colours from Stampin' Up!, combined with the tree stamps in their Winter Woods stamp set.  I used the Prussian Blue and Moss Green crystals to color the whole top watercolor mat.  Then when dry heat emboss the trees and sentiment with white embossing powder.  This is an A7 size card.

Material List:

-Stamp Set: Winter Woods
-Sentiment Stamp Set:   Timeless Tidings
-Dies:  None
-Inks:  Versamark
-Brusho Crystal Colours: Prussian Blue, Moss Green
-Cardstock: Granny Apple Green, Watercolor, Whisper Whit
-Card Base:  Whisper White A7 card (Folded Size 5"  x 7" )
-Granny Apple Green Bottom Base Mat: (4-3/4" x 6-3/4") Optional- Trim to (4-1/2"  x 6-1/2" ) see note in directions.
-Watercolor Paper Top Mat:   (4-1/2"  x 6 -1/2" ) Optional-Trim to (4"x 6") see note in directions.
-Embellishments:  Tsukineko Sheer Shimmer Spray*
-Other:  White Embossing Powder, Embossing Buddy, Heat Tool, Stampin' Spritzer
-Basics: Paper Trimmer, Adhesive Tape Runner, Tombow Glue,   Dimensionals, Mini Glue Dots, Scissors,  Big Shot

Directions:

--Cut all Cardstock pieces per list.
--Use a Stampin' Spritzer filled with Water & spray the Watercolor paper.
--Sprinkle the Brusho Colours onto the Watercolor Paper. I used more blue than green - you need to experiment to find what looks right for you.  Spritz more water if need for all the crystals to dissolve and you can add more crystals as well if desired.
--The mat needs to be set aside to completely dry or you can use the Heat Tool to speed up the process.
--When dry,  you can do the heat embossing.  First dust the card with powder from the Embossing Buddy, then stamp the trees and sentiment in Versamark ink.
--Sprinkle on the White embossing powder. Then use the Heat Tool to melt the embossing powder.  Let it cool.
--Optional - Then I trimmed the watercolor mat to 4"x6" as sometimes the edges of the card fray from all the water. Trimmed the GAG mat as well to 4-1/2"-6/1/2".
--Optional - I sprayed the top mat with Shimmer Spray* to give the card some sparkle and shine.  Let it dry completely.
--Attach Watercolor Mat to Granny Apple Green Bottom Mat & then both to the Card Base using tape runner.