Monochrome

['mɒnəkrəʊm;mɒnə(ʊ)'krəʊm] or ['mɑnəkrom]

(noun.) painting done in a range of tones of a single color.

Checker: Marge--From WordNet

(n.) A painting or drawing in a single color; a picture made with a single color.

Checker: Marsha