WordNet sense 1 (covered with bright patches (often used in combination)):

dabbled, spattered, splattered

WordNet sense 2 (overlaid or spread or topped with or enclosed within something; sometimes used as a combining form):

covered

WordNet sense 3 (spread out or scattered about or divided up):

distributed

WordNet sense 4 (spattered or spotted with dirt or filth; often used in combination):

bespattered, besplashed

WordNet sense 5 (soiled or likely to soil with dirt or grime):

dirty, unclean, soiled