I don't think you can go wrong with a large timber door. The colour should contrast with the granite nicely and will even help soften all the colder surfaces. Have you seen any doors you like? https://www.houzz.com.au/products/front-doors-prbr0-br~t_10816

Your door supplier should have given you colour swatches of any of the Colorbond range of colours. The samples are relatively true to colour and you can quite decisively use them to narrow the choice down. Check out the Colorbond range of colours on our website (scroll down to "colours" and click on them) http://www.asapgaragedoors.com.au/garage-doors. Consider Ironstone as a first choice which looks like the blended colour of the driveway, or Woodlands Grey, Basalt, Jasper or even Monument. Keep in mind that lighter colours will stand out more against the brickwork while darker colours will recede and the doors will not dominate the look of the house. The white-backed curtains are a good example of how colour can be a distraction. On first glance at the photo, the curtains stand out. I would change the back of the curtains to a darker colour. If you can't find a Colorbond colour that suits, you can elect to have the doors powdercoated in any Dulux colour.

Lauren, My opinion is as a garage door supplier in Perth. In the B&D range, the CLASSIC range of Statesman (squares), Grange (rectangles) and Federation (squares) are (IMO) dated and suit faux-Federation look homes not modern homes. The ridges collect dust & grime. Their MODERN Nullabor comes in a woodgrain finish and a smooth finish. AVOID the smooth finish as it shows up any imperfections in the Colorbond steel. The Nullabor with the woodgrain effect is most suited to rendered homes. If you want a bit of detail in your garage door the B&D Seville (4 slats/panel) is what I usually recommend for rendered homes and brick or limestone fronted homes. The slat look designs are supposed to emulate a course of bricks however I have seen installs which cast shadows between the panels. AVOID plastic window inserts in the top panel unless you want to compromise security as they can be punched out. If you want light inside your garage, install a skylight or motion activated light. Another point to note in choosing the colour... standard Colorbond or Dulux powdercoat colours are easily matched should a door panel be accidental damaged by a vehicle. Also, dark colours fade faster than lighter colours. AVOID the B&D "Timber Coat" wood colours as they are a painted finish that can't be replicated if you need to replace a damaged panel. Their new "Knotwood" range of wood colours despite the premium price are powdercoated and baked on and can be replaced if damaged. The Colorbond Caoba and Classic Cedar colours can be replaced if damaged. If you live near the coast, consider the extra cost of having your door and tracks powdercoated to stop corrosion and rust.

You say you want stain ideas for garage door. This seems unusual, because usually garage doors are not painted, they come in a colour made in a factory. Do you just mean colours. I would suggest Dulux beige royal for render. Colorbond Evening haze for garage door. Then a cedar stain for front door. Or the front door could be any colour really. Maybe Evening haze to match garage door, or even a red front door.