A couple of days ago I explained how to regain control of your white balance in Lightroom for your infrared photos. Once you have more white balance flexibility you can use to it apply different colour casts. A popular cast at the moment is using blue rather than reds or copper tones. The usually described technique for this is to adjust the channels in Photoshop. But, you can achieve a similar effect using the white balance slider or dropper in Lightroom.
Recently we were shooting at the pier made “famous” by an IKEA poster. While waiting for a long exposure to complete I was wandering around snapping away on a 20D that has been converted to infrared. The first image shows the scene with the 20D’s custom calibration profile applied. The second image shows how changing the white balance can create the blue effect.