Just to add a few more things towards the OP.
If you want an easy on openings, you can for example play KIA, King's Indian Attack, setup.
This can be played by white and black.
It is basically the structure d2d3, e2e4, g2g3, Bg2, Nf3, Nbd2.
Game collection : Bobby Fischer Wins With The King's Indian Attack
www.chessgames.com/perl/chesscollection?cid=1017725You can play this against Caro-Kann and French :
1.e4 c6 2.d3 and 1.e4 e6 2.d3
Another setup is the Lion, which can also be played by white and black. That can even be played after 1.e4 e5 2.Nf3 Qe7?!
Black plays d6, Nbd7, Pf6, Be7, and then starts h7h6, g7g5, Nd7-f8-g6 or e6 and Rg8.
In the Lion opening part you need to take care about the weak point f7.
London system and Torre attack are both fine.
London system has been played a lot by GM Kamsky, but also Carlsen, Giri, Karjakin and other top GMs have played it.
Torre attack as well as Trompovsky are both uncommon for top GMs, but fine for amateur players.
GM Timur Gareev likes to play the Tromp, and so did GM Julian Hodgson and GM Jeroen Piket in the past.
For the Tromp you need to study a bit, because some lines can be very sharp. For London and Torre there is not much to study at all, you just need to know a few ideas. Main idea is to put a knight on e5, except in setups where black plays a quick d7d6.
Apart from all this, an opening move like 1.e2e3 is also quite interesting for amateur players as white. It is a flexible move.
Depending on how black responds white can follow up with d2d4, or c2c4, or b2b3! (Owen's defense might be slightly unsound for black, but playing Owen's defense as white is fine! See games by GM Larsen, Jobava, Nakamura)
At the last olympiad it was even played by GM Carlsen, who won a fine game with it.
HTH