Just as a carpenter carries a toolbox with him or her to select the right tool for the job at hand, so a piano player has a toolbox of techniques at his or her disposal with which to make songs more exciting and have a fuller sound.
Some of the tools in the piano toolbox include:
Blue notes
Crunches
Gliss
Waterfalls
Straddles
Arps
Swing bass
Block chords
2-1 breakups
3-1 breakups
Turns
Trills
Twangs
Tremolos
Tremolo fired runs
Blues scale
Inside blues moves
1/2 step slides
Alberti bass
Locked hands
And many, many more.