I had my house rendered last year. To decide on colour, I first drove around looking at rendered houses, to get a feel for the colours & tones I preferred. Then I used the "Paint Your House" program on the Dulux website. You can either look at their various "stock" houses, or upload a photo of your OWN house. Then, using their colour selector & painting program, you virtually "paint" your house, so you can see what it will look like when done. Once I'd narrowed it down to a couple of colours, I got sample pots in full-tint, half-tint, and quarter-tint. Painted sheets of papers with them, and stuck to outside house, so I could see what the wall colour would look like during various times of day / sun vs shade /etc. It was a bit stressful worrying how it would look when finished (since I went a deep ocher gold), but I'm thrilled with the result.

Your house is going to blend in very well with it's surrounds once the timber has silvered off, if you choose to use colours like Colorbond Woodland Grey, Dulux "Pavings Stone" (left hand side of colour swatch in the image far below) and/or Dulux "Grey Mountain". Other darker colours that will work well in this setting include Dulux "Cambridge Hall" and Dulux "Nomadji" (mentioned before). These greys don't necessarily blend in with the fresh timber but look fantastic as the timber ages and the building is seen as a whole (see image far below). "Paving Stone" is a versatile medium, warm grey that looks really good as a render. It also works well as a neutral internal wall colour in rooms with lots of natural light. In the following image, Dulux "Grey Mountain" was used near the timber work and "Woodland Grey" on the garage walls to help the garage door become less noticeable. Remember that colours generally appear lighter than the sample when applied to external walls and darker when applied to internal walls.

With a million variations through a million computer screens you will get a million suggestions and very confused while no closer to your answer. You have to do the work yourself and either get a colour match to a chip the min of a 50c piece or buy a Dulux or Taubmans fan deck and select a colour as close as you can. Alternately get a professional painter or decorator to use their fan deck or atlas to colour match for you and be prepared to pay them for their time.

Dulux terrace white has a grey undertone, so should blend in well with the slate grey roof and carport roof. I would look at painting the front door slate grey to match other trims.