The Collaborative International Dictionary of English v.0.48:

Bespangle \Be*span"gle\, v. t. [imp. & p. p. Bespangled; p.
   pr. & vb. n. Bespangling.]
   To adorn with spangles; to dot or sprinkle with something
   brilliant or glittering.
   [1913 Webster]

         The grass . . . is all bespangled with dewdrops.
                                                  --Cowper.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bespangle
    v 1: decorate with spangles; "the star-spangled banner" [syn:
         spangle, bespangle]
    2: dot or sprinkle with sparkling or glittering objects