Leaves: Scatter fall foliage down your autumn trail.
Pumpkins: Line the aisle with illuminated jack-o’-lanterns.
Faux snow: Want a winter wonderland without the freeze factor? Make an aisle out of imitation snow ($19.95 for one pound at starmgc.com), flanked with urns of white birch branches.
Rose petals: Try a blanket of the real McCoy or the inexpensive silk variety ($175 for 10,000 petals at studioflauren.com).
Bamboo: To lend an authentic touch to tropical-themed weddings, use runner-width tatami mats of bamboo, reeds, or straw.
Pine needles: Fashion a forest by padding your aisle with fragrant pine needles. Buy in bulk from blackfoot.net/~sonlite/treecones/.
Lawn tricks: If you’re marrying in a grassy area, create a custom aisle by rolling a striped pattern into the grass; check out bigleaguelawns.com for instructions. Or simply cut a path through a field or meadow. (Get permission first!)