Did you see the brand new Watercolor Minis that Art Impressions released a few weeks ago? There are six brand new sets available in the Ai store - you can find them all here. I am using Open Window (Sku #4608):
These are so easy to use! There are four stamps included in the set: the window frame, the planter box, a flower spray and a vine. I coloured with Tombow markers directly onto the stamps, and stamped them onto watercolour paper. Then with a damp paintbrush, I softened the lines of the images, and pulled the colour out to paint the shutters and panes of glass. I coloured directly on the paper with a purpley/blue marker to add the shadows, and again softened it with my paintbrush. This is about a 5 minute effort:
In addition to the Minis... Ai has a huge selection of watercolour sets in the Ai store - check them out!