Hey Adam! I know this isn't exactly what your looking for, but as the others have said Chromatic Aberration could work nicely with the scene you have, here's an example of a UDK Chromatic Aberration in the UDK (By Willi Hammes) - As for the vignette you should use some offset UV's to make a mask around the border of the…
vignette is super easy, check example in the package UDK_LUT, you should do spheremask with texture coodinate and a float2 of 0.5, 0.5, set the sphere mask distance to like .4 or or something. Put some pows after that for control then multiply scene color by it. Also the chromatic abb example above will alias a lot, since…