Others might be able to help more if you give more information as to your level, and what kind of pieces (titles) you are playing.
Forum member Elyssa used to frequent the various monthly piano bars and offered a low cost online course for what she calls cocktail style piano. I can't seem to find the link at the moment, perhaps someone else has it handy.
I'm not even sure if this is what being asked, but cocktail style may be at least one answer. There are some other threads in a similar vein on cocktail piano:http://www.pianoworld.com/forum/ubbthreads.php/topics/1571694/2.html
Here is a thread on jazz, starting from the ground up, and building complexity:http://www.pianoworld.com/forum/ubbthreads.php/topics/1569787/1.html
I suggest spending time on the task. Perhaps take simple melodies of popular songs, do your own arrangements, and make them progressively more complex. Or take relatively simple arrangements and add runs and ornaments. There is quite a bit on Youtube on this kind of topic, but it often takes a lot of wading to get through the junk, and find something at a person's particular level that offers something useful.