Positive connotations:
* The architect's plans for the new opera house were grandiose, with soaring ceilings and intricate carvings.
* Her grandiose vision for the company's future was inspiring and ambitious.
* The composer's grandiose symphony filled the concert hall with a wave of emotion.
Negative connotations:
* His grandiose claims of success were quickly debunked by the facts.
* The dictator's grandiose plans for a new empire were doomed to fail.
* The company's grandiose promises to the investors were ultimately broken.
Neutral connotation:
* The grandiose scale of the ancient Roman aqueducts is still impressive today.
* She had a grandiose imagination, capable of conjuring up fantastical stories.
Using "grandiose" to emphasize a quality:
* The grandiosely decorated ballroom was a sight to behold.
* The grandiosely proportioned castle towered over the surrounding landscape.
* His grandiosely worded speech failed to convince the audience.
Remember that "grandiose" can have both positive and negative connotations, depending on the context.