I assume you are referring to the
"How to create a simple SWF decompiler with the SwfDotNet library" article, which uses SwfDotNet. Looks like it has everything you need. Have you looked at
DefineShape3Tag
, or
DefineMorphShapeTag
, or the various other classes that define shapes and such? Have you looked at the properties and sub-properties to find the color? Looks like one of the many ways of representing color is
SwfDotNet.IO.Tags.Types.ColorMapData.ColorTableRGB
. I'd just find a simple SWF file and go through all the tags, and all the properties of those, and so on until you find the color data.