Simple past tense and past participle of vignette.(verb)
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Use "vignetted" in a sentence
"Is "vignetted" (did you just coin that, or is it decorator-speak?) maybe like those open-house fake scenes with picturesque tea and scones set out and a magazine "left open" like someone was just reading it (but wasn't)?"
"I have used the Platt photograph — a vignetted head with beard — in my John Brown Photo Chronology exhibition which has opened at the Kansas Historical Research Gallery this week."
"All I saw was a swirling miasma of giant old white man heads, occasionally interspersed with a darker, younger head and some hazy vignetted off-color photographs of a thermostat, the Capitol dome and an oil rig?"