Michele Argiolas at Valuegis has been putting together some great visualizations of housing prices in Honolulu, using vibrant colors and a variety of datasets. The result is awesome images like the one seen here:
The chart shows the median household available income to purchase a 100 sq meter house at current prices, using a variety of data sources. You can try it yourself by downloading this KMZ file. You can read a bit more about their Honolulu map on their Facebook Page.
They’ve also done some other great work regarding market offer prices and Capitalization Rate spatial distribution in Italy and Spain. Their use of bright colors makes the visualizations easy to understand, and the raw KMZ files for each makes them easy to download and use.