Woah...how did you get the CRT shader on there??
GLSL fragment shaders are now supported in mojo2 (see shadereffect.monkey in the mojo2/bananas/ folder – I used the shader in this example as basis for my shaders). There is also an other shader for the NES palette system. It allows four palettes at a time, each having three colors plus alpha. I used this for implementing the two layers of the NES.