What ever colour you like is what you should go with - I have a black roof and a white house and white down pipes and guttering - the plastic type. All I notice is how dirty is looks when the winter has set in and been and gone and you are left with green mildew on the guttering and down pipes. If I have a choice and it suited my house I would go for a dark colour - however if you are going to tin you will want colour steel as the sun will just bake black or dark paint. Also look at the life time warranty of both the plastic and steel to determine which may last longer and be cheaper to fix longer term.

Cream always looks good with green, maintain the same green for windows & door. Having said that you can choose any colour by repainting the gutters & fascia etc. Get lots of colour swatches & hold them up to the roof (from a distance) to see what looks best to you. Then get some sample pots & paint so you get the proper effect of the end result. Look around at other painted homes & magazines etc, to get an idea of what you really like.

When you climbed up and took the photos , did you take a garden hose with you ? Why I ask is that most rain is steady as opposed to torrential ( depending where you live obviously ) , the tiles aren't at a real steep angle , and there's this thing called gravity haha . Basically , I suspect if you turn the hose on , you'll see the water run down the roof , and fall into the gutters -- it doesn't carry on at the same angle , even if its pretty heavy rain . And I'd say talk to your roofers about the bitumen flashing -- I suspect that behind the guttering would be fine , but they should be the experts . And it sounds like you are lifting some of the tiles to do this -- make sure you get someone reputable -- no use fixing one area but creating leaks somewhere else .

If you want a light render and you’re looking at Surfmist for the garage door then use Surfmist for the whole thing. You don’t want more than three colours inc your bricks and monument so that gives you one other colour for everything else.