There should be some features to get your house painted, it will make houses looks like more attractive and players will be willing to buy such decorateful house.
Just like how we paint our car, we put colors that we want. Same should be applicable to houses.
Alongwith, featuring paintjob for players would be better too, meaning if we want to get self house painted we would need to call a painter or if not then painting own house could be a good option.
I know most of players will not like this suggestion as many of players play mcnr for killing and dm purpose only, they don't have knowledge about the other things like Mcnr is tinybit relatable to real life, so getting features related to real life things could be a good option.