The Collaborative International Dictionary of English v.0.48:

Festoon \Fes*toon"\, v. t. [imp. & p. p. Festooned; p. pr. &
   vb. n. Festooning.]
   To form in festoons, or to adorn with festoons.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "festooned":
   adorned, beaded, bedecked, bedizened, befrilled, bejeweled,
   beribboned, bespangled, colored, decked out, decorated,
   embellished, embroidered, fancy, feathered, figurative, figured,
   florid, flowered, flowery, garnished, jeweled, lush, luxuriant,
   ornamented, ornate, overcharged, overloaded, plumed, purple,
   spangled, spangly, studded, tricked out, trimmed, wreathed