Here's a copy of my ColorBlendModes ICE compound: http://www.si-community.com/download/compounds/DW_ColorBlendModes.zip
There's only a few options so far (Normal, Add, Multiply, Screen, etc.), but I thought I'd offer it to the community. If you find any problems, or want me to implement a specific blend mode, let me know. Even better, if you have an ICE tree for the blend mode, it will be even easier for me to update!
Opacity is clamped between 0 and 100. Alpha isn't utilized.
Video and images soon to follow.