I always go toward the ''freeware'' option. :}
As far of complexity, well, there will not be too much ''props''. The main thing is in correct usage of the shader we have in the art thread and this atmosphere we need to make.
Fact that u don't have comp that can run shaders can be difficult.
Give me some time to put on paper what I have in mind, then I'll post it and u think about it... No rush.