Madame Marie Curie was the first person ever to win two Nobel Prizes. Her first was in Physics (1903) and the second in Chemistry (1911). So what did she do with the money? She used part of the prize to both change the wallpaper and to put a modern bathroom into her Paris home.
Source: The People’s Almanac by David Wallechinsky and Irving Wallace, 1975, Doubleday and Co.