I would recommend checking out the Zaitsev System (9. ...Bb7) of the Closed Ruy Lopez.
The idea of this variation is to build up pressure on e4. In this position the b7 bishop, the f6 knight and e8 rook are all targeting the e4 pawn. If white makes a careless move, then e4 will fall.
For example:
It can get very sharp and tactical.
I have been playing the Berlin Ruy as black everytime I face it, its not that I am good enough to play for a draw in Berlin but I wanna play it more risky now, I should be challenging myself.
I have heard that Schliemann makes white pretty uncomfortable, but other than that I am completely a noob to Spanish, share me your wisdom, will ya?