Here is my recent NGC 2244 and Rosette data arranged as a bi-color. In this rendition, I have mixed the Ha [+NII] data with SII at a 2:1 ratio. These wavelengths, which fall in the red part of the spectrum, became Red. Blue in this image comprises OIII and Ha data mixed at 4:1, and Green comprises OIII and SII data mixed at 4:1. The color strengths were adjusted after combination to emphasize the difference between red and blue, so the contrast visible here is between Ha, NII, and SII, on the one hand, and OIII on the other, red v. blue-green. Capture data for this image appears in the Hubble palette post for this object, dated February 4, 2013. The telescope used was the AT111EDT, the camera the SXVF-H9.
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