Trompe l'oeil can be as simple as an open window, adding visual depth and dimension to an otherwise boring room.  It can be as complex as a large mural or as simple as a mouse sitting in a corner.
The options are endless...
Kitchen grapevine
with detail of leaf below $400
The Decorative Artist.com
Trompe l'oeil
Faux stone with scrollwork.
Topiary $300.
Why bother hanging and maintaining a real wall rug?  This 4'x6' rug is $550 and doesn't collect dust.
Faux marble.
Trompe l'oeil winerack.
An otherwise flat wall was brought to life with this picturesque landscape.  Trompe l'oeil windows such as these average $400 for a 2'x3' size.  This bathroom also has antiqued walls.
Another flat wall given depth through a painted niche.
These exterior bricked-over door and windows are renewed. (Left door real, right door was a flat wall)
Photo couresty of the Daily Record newspaper
A large foyer makes room for these french doors leading to a tranquil setting.  The rail and spindles have also been reproduced with paint adding depth.
$2500
Trompe l'oeil window augmented with faux stone.
Faux flagstone with moss helped give an outdoor feel to my shop called Scotland Yard.
Paitents in this waiting room have a peaceful view and can relax while waiting for the dentist.
No grout lines here to clean.  All of this tile is fake.  A painted cornice just for fun.
TROMPE L'OEIL
TROMPE l'OEIL
MURALS
HAND PAINTED FURNITURE
POEMS & QUOTES
KIDS' ROOMS
DECORATIVE 
TOUCHES
PAINTINGS
After completion, many heads turned towards this furniture store.