Dont get into the habbit of making a loop sounds good on its own. Quickly get a loop down, and if it grabs ya, quickly plan a track out in your head and work as fast as you can to get all those ideas into the track. Then you can work out the rest later.

I always get a loop going quickly, and before i get bored with it, i make other sections of the track away from that loop. Then i'll work out how to piece em all together and sort out any production issues with them..