Banachek on his Psi series has a totally gimmickless PK pen effect which he does combine with his gimmicked PK pen effect which i highly recommend.
Theres also a gimmickless chopstick effect thats similar i've seen Akira Fuji use.
I've explored PK effects probably more than most. At the end of the day i think Banachek's PK pen is the best. And also the classic rising card.
As for gimmickless pk effects, heres something i've created today
i didnt know u posted this, "red bull gives u wings" lol