Hi,
Perhaps you would want to look at patterns from elsewhere, which you can actually use on the piano.
One of them will be guitar strum patterns and bass riffs or drum patterns;
Imagine your left hand as bass and/or drums and your right hand playing guitar patterns ; your left-hand can play rhythms like those of drum-fill-ins or lead-ins, or typical bass riffs, for different grooves. Right hand can play guitar strum patterns, who r sometimes syncopated or off-beat
Personally I feel to make a piano arrangement interesting; one has to make full use of what one knows; using different registers of the keyboard has different kinda effect, playing arppeggios leaving certain notes out n adding others give different kinda sounds, using scales/fill-in/riffs and also reharmonising the tune, adding embellishment chord etc are things one can do to "enhance" an arranegement.
Hope this helps!
Regards,
KJ