For example, use modeling paste within angel wings. I think the dimension it adds to this piece is lovely. On this piece, not only is the modeling paste emphasizing her wings, but also a pretty shimmer paint too. I just dragged my palette knife (or popsicle stick) across the space of the wing in the same direction. If I went out of the lines of the wing, I simply wiped it away with a damp cloth or baby wipe. Easy!
More angels with textured wings...
What about flowers? Spring is almost here, and beautiful blooms are everywhere. Why not use modeling paste?? Below is a canvas I painted for my master bedroom in light blues, creams and grays. On the large flower petals, to add that visual interest again, I "painted" with the modeling paste. I used the same technique as the wings. After the paste is completely dry, I used watercolor and acrylic paint on top. I love how the raised parts of the petals collected the color. Oh, and remember that you can add paint color directly into the modeling paste before you use it too!
There are many different shapes try - hair, animals, grass, ocean, mermaid's tail, clouds. Those are just a few that come to my mind. What can you think of? Why not go give it try!! :)