A computerized method of (a) calculating shape and color features of existing designs from their 3D polygon models, (b) analyzing the designs by representing them as vectors in a feature space, and (c) searching for a distinctive usage of shape and color as a vector furthermost from the existing vectors in the space, is proposed. In this method, a distinctiveness of a design from existing designs is mathematically defined and used for the search process. A searched solution should help a designer to think of a new design distinctive from existing ones to attract consumer attention. The proposed method is implemented as a software and applied to simplified models of nine personal computer designs and seven digital camera designs.