On a scrap piece of paper, I worked to create a birch tree - on the left side, plain; and on the right side, with texture medium inside the treetrunk using a palette knife. I like the way the texture medium made the paint do its thing easily and create a nice tree shape and look. I painted the background greens after I painted the trees. This looks better in person when you can actually see the texture on the trunk on the right.
You don't always have to be painting a masterpiece to get your brushes wet and feel like you're still progressing...just paint something small and interesting and see what it becomes. Could become a little card or insert to a card to a friend...you never know.
I think the tree without texture medium would have turned out more "textury" if I'd painted with a flat, dry-ish brush.