Here is the sketch.
For my card I chose to use the Mosaic Madness stamps from Stampin' Up! I started off by watercolouring a piece of Ranger water colour paper with various colours and once it was dry I stamped and punched out my mosaic shapes. I then splattered the water colours onto the white background.
cardstock: Ranger Watercolour paper, white card stock
Stamps: Mosaic Madness by Stampin' Up! Sentiment from My Favorite Things
Other: Watercolours, Mosaic Madness punch, circle die from My Favorite Things, sequins.