Selection of a subset of possible color values is a common step in color imaging. Color look-up tables or profiles are often constructed using uniform or regular sampling schemes for a given color space. Color order systems are often constructed based on systematic geometric schemes, such as the radial configuration of the Munsell Book of Color or the cubo-octahedral configuration of the Optical Society of America's Uniform Color Scales. This paper explores the use of an irregular sampling scheme for the creation of a custom color chart and analyzes the performance of the chart when applied to a mobile color sensing application. Because it allows the set of colors to be expanded in increments of one color, this scalable sampling scheme has a wide range of applications, including device calibration, and for computing unique color fan decks and spot color charts.