What can non-standard properties of globular cluster systems tell us on its host-galaxy formation?

I present new and recent results regarding globular cluster (GC) systems whose properties show characteristics that depart from those considered as "classical" properties. For instance, cases of colour distributions showing three GC sub-populations instead of just two, that may have originated during a recent merger like in NGC 4753 (Caso et al. 2015, also supported by the existence of two type Ia SNe hosted by this galaxy), or that can be interpreted as the signature of a quite old starburst like in NGC 7507 (Caso et al. 2013), where no signatures of a merger are identifiable. In addition, in both cases the respective specific frequencies Sn are surprisingly low according to the host masses. A new analysis of the GC system of NGC 3610 based on GMOS/Gemini data is currently under way, which is the first wide-field study of this GC system. This galaxy is considered a bona fide intermediate-age merger remnant, and part of its red GC subpopulation presents a power-law luminosity function (instead of the common Gaussian-like), as expected if formed during a recent merger event.