I've been a big fan of Pinterest for a while now. I use the site in a variety of different ways (for example, see here for menu planning -- amazingly, I still have pretty much the same system three years later) but for home decorating I find the most useful thing is that it helps me figure out what the heck I like.
I simply pin images as I come across them to a given board, and over time the themes that tie those images together become clear. I'm a splitter rather than a lumper when it comes to Pinterest: I think creating boards with fine-grained topics like "Bedroom" and "Bathroom" is much more helpful than those broad default boards ("For the Home") that the site gives you when you sign up.
For example, here is my Bedroom board, which I've been looking at quite a bit to try to figure out how to put together our new adult bedroom.
I think it's interesting that some of the oldest images on that board are still pretty much in line with what I'm aiming for:
Apparently I know what I like, even if I can't always explain or describe it (and often don't manage the motivation and chutzpah to carry it out).
Below are images illustrating a few other common themes that show up in my pins -- in other words, elements of the style I'd like to achieve.
A simple, mostly white canvas:
Color from textiles:
And from art on the walls:
A little bit of black (or very dark color):
A plant or two:
Making space for sentimental things (more important than strictly adhering to a consistent style or period):
And finally, curtains to close off the visual chaos where necessary:
Can you see it coming together?