Damn it's nice to hear someone else saying things like that - I thought I was alone for a while

I frequently used to produce improvisations based on the stained glass windows at the cathedral, largely because they provide such a rich source of colour - literally, metaphorically and musically (can't anymore because the console is facing the wrong way!

)
FJM - so far I won't disagree with any of the suggestions here and I'll certainly reinforce the notion that inspiration will never strike at a computer. Sometimes, the more "unmusical" or unusual the influences, the more extraordinary the music. If you're ever uncertain about anything, arm yourself with some basic knowledge of form and structure so that you can use a framework within which to place and develop your idea ... ANY idea.
Also, never be afraid of simplicity. Remember that a great deal of the best music for centuries has been based on something simple and there are almost too many examples to mention. I've just been teaching one of my classes about Beethoven's 7th Symphony - the 2nd movement is an amazing piece which is essentially built around an incredibly simple rhythm.
Ritchie Blackmore originally thought his riffs for
Smoke On The Water and
Space Truckin' were too simple - it took the other guys in the band to say "No they're great, let's use them!"
Your idea can be anything - a rhythm, a tune, a three note riff, a chord progression, it doesn't matter. Just grab it with both hands and hang on to it, then look at it carefully and ask yourself "Right - what shall I do with you?"
Hope that's of some help. Have fun.
Matt