Decorative painting can be many things. Murals, trompe l'oeil (French for "fool the eye") panels, faux finishes, painted cabinetry and furniture, grisaille (painted in shades of gray) decorations, canvases that are marouflaged (applied like wall paper), and the list goes on.
Below are some samples of different types of decorative painting projects I have done. Let your mind wander. I would be happy to consult with you on any project you might have in mind. Or perhaps come up with something you haven't thought of yet.

Painted windows - day and night views

Canvas painted to blend with wall and appear as a "window" 5'x7'

Canvas paint and plaster - faux fresco - to be marouflaged 4'x5'

Wine cabinet faux burlwood door panels

Bedroom wall multi glaze metallics

Textured and multi glazed hair salon wall

Powder room red glazed