Against Ruy Lopez try the Schliemann variation ( 3 f5!?) or simply on e4 e5 nf3 play f5! the highly recommended Latvian Gambit played by Magnus Carlsen.
Solid non-passive openings for black
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I can see that you like closed/positional rather than open/tactical. If you want to make a transition over to the tactical side of things but still feel in your waters I firmly suggest the French defence. I'm a detractor of the french and have never taken it up as part of my repertoire- I fell it still lacks activity for my style of play but for someone making a transition from a Ruy-lopezSteintz variation this is more than enough activity. While I'm not crazy about the French for black it does have its merits. Its very solid and depending on who you are playing things can get VERY exiting and it could really help you improve. You can start by trying out the classical variations first and if you want ot go a bit further in tactics and sharpness go for the French Winawer variation (that in my opinion is THE way to play the french for black). Anyhow look into the French you may like what you see.
I would second that french recommendation; in fact it was the opening I switched to after being annoyed by the passiveness of the black positions after 1...e5 sometimes (particularly the ruy lopez). Granted, that was only because I didn't know how to play very well, but the french seemed like it had a more constant plan: to pressure the central pawn chain with ...c5 and ...f6, and I did much better with that. It was a solid structure but in my amateur-ish experience the white players often couldn't keep their center together and I got dynamic central play in most of my games; or sometimes they'd just drop a central pawn for no apparent reason -- that was always fun. I think white players just naturally aren't as experienced/prepared against the french because although it's not uncommon, compared to ...e5 and ...c5, it can seem rare.
There is of course no way to consistently avoid tactics at least some point in the game, but still I think it's something worth trying.
If you want to play actively against the Ruy Lopez as Black, Schliemann's gambit is probably a good choice (but it needs some study to play it effectively). It's more solid than the Latvian, plus you are not committed to a gambit as early as move 2.
Btw, when did Carlsen play the Latvian ?
I like the idea of the French too.
I'd supplement it with the KID. It's certainly not a gambit, but does tend to get open and tactical as the game progresses. And in many...possibly most...lines, black ends up playing for f5.
Atos wrote:
Btw, when did Carlsen play the Latvian ?
[searches database]
Apparently, never. Although it was played by Carlsson; must have got confused 
He played it in rapid, not there on chessgames. Also, loads of these games transpose.
The Winawer Posioned Pawn is a beauty as is the Posioned Pawn Najdorf Sicilian.
I am really fond of the Najdorf Sicilian and play it almost exclusively now against 1.e4; it is probably Black's most aggressive response and has a much higher win chance than other openings for Black. And I ALWAYS play for the win.
But the French and Caro-Kann are both very good openings in their own right, and are also quite tactical and fun.
Against 1.d4, I reccommend the Grunfeld; the Slav and Semi-Slav felt far too cramped for my liking when I used them, and the Grunfeld is more active and aggressive. 
I'm currently a uscf 1400 and have been playing chess in tournaments for 1.5 yrs now. I'm looking to try out some new openings for black as my current ones feel a bit passive.
As white I play:
Guiccio Pianisimo: (Solid, My b2 night normally gets to the kingside via d2, f1, g3 and I play over there and in the center) I know this oppening seems a bit passive, but I've done well with it and my opponents often make mistakes in it. Gives me plenty of scope to do stuff.
b3 vs sicilian: (light bishop comes out to b5 and trades, f4 gets pushed and I attack on the kingside and middle) I've had nice games with this, the kingside attack normally succeeds.
As black I currently play:
Hungarian defence: (passive, but I normally get to do an f5 break and get some play on the kingside) Feels slightly cramped, but f5 normally gets rid of it. This is my favorite opening for black at the moment.
Against ruy lopez: Steinitz defence (feels very passive and cramped. Never have a real good plan in this) My least favorite line to play as black.
Queens Gambit declined: (I play this against d4 and transpose into it against other stuff. Feels a little cramped, but not so much as ruy lopez.
What I want:
I'm really looking for solid openings and lead to open games. In hungarian and b3 sicilian I've grown to like f4/f5 pushes and the like, so if there are other openings for black with those, that would be great. I dislike cramped positions, and much perfer open ones to closed. However, I don't really like gambits all that much. I could try them, but they would have to be pretty mild. Also, something with a clear plan is nice. I'd like to avoid the sicilian due to the ammount of theory there. Tactical openings are far better than positional ones for me.
Note: I'd especially like stuff to replace my Ruy Lopez defence with. I've tried neo-steinitz and I liked it a lot more but other suggestions there would be the most helpful (both for lines in it, and lines to avoid it)