Firstly, where are you located? Monument is one of the darkest colours. Darker roof colours will have lower heat transfer properties. In other words, very hot in Summer. If this isn’t a problem, have you considered a lighter contrasting colour? If you know what you like - warm or cool tones - you can start to narrow things down from there, putting contrast between your roof and front facade, using trim like windows or guttering and fascia to tie in the roof colour or contrast it.

Thanks alot.. I am from sydney