Fill a large, square clear glass vase with bright red cranberries or orange kumquats as a fresh, seasonal touch. Use orange, gold or deep red glass gems in place of the fruit if you prefer. Choose dried corn or sweet candy corn as other options. Make sure the vase is tall enough to accommodate the silk flowers you are using.
Nestle the stems of autumn-inspired silk flowers into the fruit or gems for a secure fit. Use a mix of yellow black-eyed Susans and ranunculus, orange Gerbera daisies and lilies, deep red roses and purple hydrangeas as a vibrant touch.
Accent the arrangement with fall-themed décor pieces. Add stems of faux autumn-hued leaves, twigs of orange and red berries, dried eucalyptus or straw.
Finish the piece by tying a decorative ribbon into a bow around the middle of the vase. Choose a red or burnt orange velvet ribbon for an elegant look or a plaid grosgrain ribbon as a country-inspired touch.