The dreaded London System
I've picked up somewhat of a fascination with the London System. I noticed some games by Boris Grachev on ICC and then I half-heartedly picked up a book by Lakdawala on the opening while playing in the UK at the beginning of the year.
I almost only used it in blitz games but with quite ok results. I still have some problem lines that I need to fix there but in general the good thing about the opening is you can play the first moves more or less on autopilot i.e. 1.d4, 2.Nf3 3.Bf4 vs almost anything.
Check out these two recent blitz games on Chess.com with the London system where I got attacking chances out of this otherwise innocent opening (at least by reputation!)