In this chapter, we focus on design techniques that employ a particular form of design materials, namely design cards. Design cards can support different phases of a design process, from initial ideation through ongoing concept development towards evaluation of design concepts. We present three different techniques, namely PLEX Cards, Inspiration Card Workshops and the Video Card Game, and how they are used. Once we have illustrated the three techniques, we discuss general characteristics of design cards that make them great tools in collaborative design (i.e., tangible idea containers, triggers of combinatorial creativity, and collaboration enablers).