The talk is a survey on recent existence results of generalized complex structures in dimension four. We begin with a brief introduction to generalized complex geometry. Then, we move on to discuss recent cut-and-paste constructions on smooth 4-manifolds that have unveiled interesting phenomena regarding existence results on a myriad of manifolds, and information on the number of path components of the type change locus of a generalized complex structure, hence improving drastically our understanding of these geometric structures. The talk will be example-driven.