One of the tricks I picked up from working at Google is a very simple way to make sure your interface feels on-brand: Start with the core brand colour. Let's say it's blue. You create a palette of blue shades from light to dark, almost white to almost black, all with a blue tint. The text isn't just pure white. It's a very light blue. The background isn't pure black. It's a very dark blue. Using these throughout the core elements will create an almost unnoticeable but present brand 'feeling' through the interface. It works especially well for trading interfaces where the positive/negative colors can easily dominate, making it hard to incorporate your brand without it being jarring. This technique works perfectly for any product and industry.