It's no secret that we, the artistic types, have a tendency to over analyze things. In fact, I'd say to some degree, the more artistic you are, the more prone you are to some level of perfectionism.
While some may hold the banner of perfection high above their heads, there does exist a greater possibility that too much time on an idea, concept, or melody can ultimately reduce the original promise to something that's over complicated and unworkable.
This is especially true with music. If you think about it, some of the best songs you'll ever write tend to be songs that just flowed out of you. You didn't really think, you just played. I know for me, I've written some of my best works when I was actually giving a class, or a demonstration. I'd just throw some stuff down quickly, for the sake of time. Then, before you know it, I'm jamming out and it just sounds good.
After doing this a few times, I decided that it was time to figure out the formula for this lightning creativity. And, here's what I came up with'"The 5-Minute Rule. Try it, and see if it works for you.
Step 1 - Play, but don't think...
Start off with any instrument within your DAW, hands, or even whistle. Don't think about it, just record whatever comes to mind. It doesn't have to be good, it doesn't even have to feel right. Just do it! Though, I would suggest keeping the recording somewhere in between 8 to 16 measures. You don't necessarily know if this will be a chorus, intro, or what not. But, it is good to have it segmented with some sense of organization. Plus, you want to be able to loop, right?
You may be tempted to start off with a favorite patch, or something familiar. I, personally, would advise an instrument, or patch that you've never used. Remember, you can always change it later.