The violin is known to be one of the hardest string instruments to play. Once you know how to play this, then you have truly made an effort to learn. This is normally used to play classical music but this can always be used to play rock music too. The sound of the violin is very diverse and it is also very distinct.
It may not be obvious in the beginning but you can actually incorporate the violin into the rock songs that you love so much. It can add a twist to the songs that you already know how to play. Any instrument can be used to play rock n roll as long as you would become more open-minded to the possibility.