When I get an idea for a recording, I first have to see what I can do to make sure it doesn't already exist by someone else. It's not that I think I'm 100% original, it's that sometimes "inspiration" comes in the form of me looking at my CDs (or my hard drive) and craving to hear a certain sound, but finding that it's not there, and I just can't quite place it.
In my case, it's usually just a particular take on loops, or a certain spin on "dark ambient", "Industrial noise", "Power Electronics", etc, but other times it is an idea that I couldn't fit into these categories, and I don't know where it comes from. So I'll search, for lack of memory, and then when I can't find it, I'll do what I can to make it myself. Sometimes, but not always, it'll be an idea that would suit a particular feeling/tone/vibe that, while it may not necessarily be "emotional", would still suit me in a time where that particular mood could be complimented by listening to something.
It's always been this way for me, even when I was more musical, but now I look more for non-emotional themes to sounds; things that can't be pegged with the simplified concepts of "sadness" or "anger" etc. When I'm finally finished with something, and this can take a very long time, I don't often listen back unless I am curious about what territories I was trying to figure out at that time, and if I can expand on or add to those territories, or if the territory explored is more or less suitable for my mood at the time of listening.