Formal:
* "The orchestra played the symphony marvellously, capturing the composer's intent with breathtaking precision."
* "The chef's use of spices was marvellously balanced, creating a symphony of flavors on the palate."
* "The artist's ability to capture the fleeting beauty of nature was marvellously displayed in the landscape painting."
Informal:
* "The kids had a marvellously good time at the amusement park, riding all the rides and winning prizes."
* "We had a marvellously relaxing holiday, spending our days swimming in the ocean and reading books on the beach."
* "The party was marvellously fun, with delicious food, great music, and even better company."
You can also use "marvellously" in a more literary or poetic way:
* "The sun dipped below the horizon, painting the sky in marvellously vibrant hues of orange and purple."
* "The old man's eyes sparkled with a marvellously youthful spirit, despite the wrinkles that etched his face."
Remember that "marvellously" is a more formal word than "marvelously". Choose the one that best fits the tone and context of your writing.