I haven't used any color filters, but I have used custom White Balance settings to simulate them. If you set the WB to a distinct color, you will get an overall shift to the opposite color (on a color wheel). My recent "Green" entry had the WB set to Magenta, and my recent "Night" shot ("Blue Moon") was made setting the WB to Yellow (similar to using the Tungsten setting). I was thinking of submitting something for "Golden Hour" using a yellow cast (by setting the WB to Blue) but ended up submitting something else ...
I carry a 4x6 print of these color swatches in my camera bag so I can do this almost any time -- feel free to download it and try it out ... the upper two rows represent true opposites, the bottom just assorted colors to experiment with.
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