Responses to 1. d4

Can anyone suggest a response to 1. d4 that would create a more open and tactical game than my usual 1...d5?  Any help would be most appreciated!

Nf6

Try the Benko Gambit, Benoni Gambit, or Nimzo-Indian defence. Grunfield maybe.

nardis- you want to create an open, imbalanced, tactical game.. so the modern benoni or the grunfeld would be sharp choices. budapest gambit is another fun try

Oh yea, forgot all about the Budepest. Love that opening.

By the way, you can check out an article (or 2, forgot) about the Nimzo by the two GMs Arun and Magesh on chess.com if you search for it :) It should be fairly recent, page 1 or page 2 of the articles.

Queens Indian?

The Albin Counter-Gambit is usually tactical and interesting:

Check out the stats in your database, Black does surprisingly well.