To add a crackle finish to my dollhouse window box I used Ranger Distress Crackle paints
This paint is available in several colors, including white and metallics. It goes on very thick. For miniature crackles you may need to thin it a bit with water. If you want a color showing through the crackle, paint the crate with acrylic paint in your chosen color and allow it to dry completely before applying the crackly paint. The miniature crackle paint can be lightly sanded to further the weathering effect, but when you have the look you want, you may want to apply a clear matte or satin glaze over the crackle to help hold it in place. Otherwise handling may cause your paint to wear more than you wish.
To set up the windowbox, I used reindeer moss behind the cutouts to give it a moss basket effect, and set the plants into a small piece of dry floral arranging foam cut to fit inside the box. The top surface of the foam has a layer of reindeer moss on top.
