monochromatic is at least adjacent the word you are looking for, in which the art/object/craft is of any color, but only that color and its tints and shades.
Though unless the stripes are in different shades to each other like light/middle/dark, even all still being like "green", idk that it applies
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Re: More baskets
Though unless the stripes are in different shades to each other like light/middle/dark, even all still being like "green", idk that it applies