Here I've changed the color palette by creating a new file 'color-palette2.properties' and putting it in the 'resources' directory.
You then reference this file as in the example below by modifying the 'colorPalette' PARAM. In this way, you can provide different
color palettes for each image, if you wish. At some point I'm hoping to allow changing palettes via JavaScript, so that designers
can create a palette-change UI in their pages. The "color mixing" code is written in "Big Kid mode" (see: http://www.alexsboxofcrayons.com and try the "Java2" demo),
but this portion (along with the "stamps and stickers" functionality and custom cursors) is still in need of further testing and debugging.