Linda the image above uses a pediment type of scenario, and creates a recessed gable, however with one side of your home having a parapet and the other, a floating gable without a soffits, I think it wouldn't work. I think the strapping i showed yours easiest and most effective as it won't look like fixing an error. As for no shingles, they are my first pick, but very particular and you lean either way, I'm for them, but only real ones, not the fc product ones which have wrong proportions all round. I could only suggest using a batten arrangement in the same way as your gable, otherwise the lining boards look best. These can be sheets, so fixing would be easy. It would tie in with your porch roof being lining boards too. The main thing for me is that window awning, put architraves to the exterior of that window frame, paint it the dark blue colour, to conceal the white window, that's why I suggested white timber details, to make sense of this error.

The style of your home stems from the gothic style in the 70's, 1570 to be more exact. The gothic period lasted from around 1485-1603. The Gothic Revival style started in England in the late 19th century. I suggest searching images of Gothic buildings built during the Gothic period to see if there are materials that you like. If you can't find any, search for images of Gothic revival buildings for examples of materials that you think will work. If that doesn't work, then the next comment may be of some help.

Sound like good ideas to me. Orange door would look good with dark grey render. Stain any timber work charcoal. Also add horizontal boards at the house gable. Incorporate the low wall in the front fence idea by making it higher - maybe just slats so the garden can be seen through it. The mail box could be in there too. Make a further statement with fast growing trees to create an arch over the entry gate.

I am guessing this is not in Australia? You could do any colours. But what would fit in tonally with neighboring properties? Are you looking to stand out, or be restful? So many options, you need to give some more information