Lucky Prep

Images

MiniPaint (raster image editor)

Google Slides (File > Download > current slide)

Google Drawings (allows transparent background)

Pixlr (raster image editor)

Color: Wonderful explanation of different "color rules" and their intended impact on an audience

Game Design

Scratch (Blockly from MIT)

Snap (advanced Blockly from Cal)

Blockly Games (great tutorials)

Creating with Chromebooks (lots of options)