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Abstract: Phenotypic diversification abundantly reuses existing variation that is available within species or introgressed from other species. Still, insights into how such variation is integrated with new mutations to form new phenotypes and how this process may be limited by genetic architectures remain scarce. In this talk, I discuss how a simple single-gene architecture that controls the melanic plumage pigmentation of birds (ASIP gene) can be combined with coding and non-coding (transposable element insertions) variation from different evolutionary sources (de-novo mutations, standing variation, adaptive introgression) to give rise to different tissue-specific coloration patterns as well as to the convergent evolution of this coloration in wheatear species (genus Oenanthe).