LOL - Klimt did a few straight pieces, and they are excellent. I have a large one on another wall. Just don’t want the bright floral nekkid girl. I have a thing for de Lempicka and ‘Metropolis’ lobby posters that won’t quit, and that piece doesn’t work with it very well. Schiele’s good, too - just not as much fun.
Cool thing is, you can grab a file of anything you like or do an original painting or photo and have it made into a canvas print or a Wall-E you can stick on an existing canvas, so there’s really no limit beyond active copyright. Heck - do a photo of your sofa and hang it over your sofa just for kicks. Whatever grabs ya. Anything decent that size from any other store can easily run several hundred just for a framed print of poor quality.