To bespangle is to cover or adorn with spangles—small, glittering ornaments—or with anything that sparkles like them: Stars bespangled the night sky.
The word is literary and somewhat old-fashioned, evoking decorative brilliance.
It appears most famously in the U.S. national anthem: the star-spangled banner.
1. glitter — sequins, Small reflective fabric ornaments; sparkle (Emit flashing light); shimmer (Tremulous, wavering light); glimmer (Faint, wavering light); twinkle · glint · shine · gleam · scintillation · coruscation · flash · dazzle · glisten · radiance
2. adorn — bedeck, To ornament elaborately; festoon (Ornamental hanging chain); embellish (Add decorative elements); array (Ordered collection or display); deck · drape · trim · garnish · beautify · ornament · grace · enhance · enrich · gild