use one of those panels as a background and add color with Distress Ink (Weathered Wood) and a Mini Ink Blending Tool
spritz that background with Pearlized Water for more texture
cut the Poppy Stamps House in the Woods from the other panel and color the trees with watered-down Distress Ink (Iced Spruce)
stamp the sentiment from the Create a Smile Happy Mail set with Versafine (Vinatge Sepia) - I used my Mini MISTI to get a crisp impression on the textured surface