Here is an IR of trees with the sun backlighting the leaves. After some adjustments in Lightroom 3, I used Nik Silver Effects Pro to convert to black and white.
Then I applies the Polaroid Transfer filter from Nik Color Effects 2 to produce this colorized image. I made sure to remove the filter from the “sun-burst” so that it did not blur. The filter also produces a funky border to enhance the “Polaroid” effect.