As white, play e4 aiming for the king's gambit, or the Albin counter-gambit (I think it's called) which is 1. e4 e5 2. d4 exd4 c3.
To e4 e6, playing b3 is fun to play, with simple ideas of just sacking the e4 pawn for a nicer position/ better development.
To e4 c6, well I play at your level and hardly anyone plays the Caro-Kann. If they play this, maybe just play it normal with d4 and after d5, e5, the advance variation, is popular at GM level, and Carlsen got beaten with it recently, and the games tend to be exciting. In fact, here is the game I'm talking about
:
http://www.youtube.com/watch?v=JdCnzQ5RyFU
(and)
http://www.youtube.com/user/kingscru.../4/8G-bAMLyd5E
The idea is that black basically has something similar to a french defence, but with the bad bishop outside the pawn chain (on f5). But white can have crafty ideas of his own, and often this bishop is actually problematic for black (as in the carlsen game).
With the knight on b3, black never gets a chance to play c5, and the ideas behind the plans is what makes playing this line attractive: they're so simple! White's strategy is just to clamp down on c5, and to just dominate the game from either the centre or the kingside. Just look at white's position- it's so comfortable!
Against 1.e4 c5, play 2. d4, the morra-smith gambit. I have good results with it. It is easy and fun to play, after 2...exd4 c3. After dxc3 Nxc3, most people prefer white in this position for obvious reasons. After 2...Nf6, I think the move is e5, which is also fine for white. If black tries to complcate up the opening, you always have good resources, and no development issues.
As black, against d4, the budapest gambit is fun to play, but often complicated. The plus side is that there are loaaads of trapsthe white can fall into after either Ng4 or Ne4. For example here:
http://www.youtube.com/watch?v=7tec79T6Biw
The budapest is dynamic, trappy (and not crappy), and often takes white by surprise. Also, a lot of moves are forced even out of the opening, so learing some of the "theory" is quite easy here. Tbh, I need to learn some of these openings in more depth. I know the traps, but the plans are really important, especially if your opponent avoids the traps.
Against e4...well e5 is as boring as hell, the french is tricky for black unless you're an expert...I suggest Alekheine's opening. At our level, white weakens himself by over-extending the pawns (unlike GMs who know when enough pawns is enough), so they have loads of weaknesses in the position. However, you need to know when to play what moves when, as the opening is often critical, otherwise the central avalanche can be crushing. It's better than playing e5 though, because e5 gives white the initiative, whereas Nf6 declares that it is you who is going to dictate how the opening is going to be played.
I'd suggest you avoid the Ruy Lopez, because although you get interesting positions, there is so much theory that it makes me sick. And it is hard for white to go terribly wrong out of the opening, whereas black can blunder easily without huge amounts of preperation. Same with the sicilian (don't play as black).
There's my suggested repertoire. You don't have to take any advice of course, but at our level, the main thing is to have a plan, the second min thing is early development, next is knowing all the traps, and 4th is theory.
Try out the openings: play loads, and hopefully in time you gain some points. I need to take my advice as well...sigh.
Also, just re-read your post, and you wanted to learn "one or two" openings. This is impossible. I've listed more like 7 or 8, but they're quite easy ones to learn compared to the ruy lopez or sicilian, which have huge amounts of opening theory. Hope this helps. PM me if you want to play me