Undrawable Openings? What are some openings that are extremely difficult to obtain a draw in? I have been recently playing openings like the Ruy Lopez and facing a lot of draws.
If you play more aggressively and choose sharper lines, your draw rate will go down - though not necessarily the way you want it to.

Generally gambit lines are sharp, whether you are giving or taking the pawn. So you could play the King's Gambit instead of the Ruy Lopez.

Another possibility is to play the Italian Game and choose the Evans Gambit against 3…Bc5 and 4.Ng5 against 3.Nf6. 

But although the Ruy Lopez is a rather strategic opening, a high draw rate in your games is more likely connected to your style of play. If you keep the tension, i.e. not going for exchanges, and try to build a strong kingside attack, you should get a lot of decisive games even in the Ruy.