Following on from the previous, has anyone any good suggestions for crazy 2d effects to try out? Doesn't have to be even remotely sensible or grounded in reality, just something that would make you go 'that looks cool'. Or variations on existing effects would be good as well.

So far I'm thinking:
- Heat haze/distortion
- Glow/bloom plus a couple of variations
- Particle shading
- Water ripples
- Pallette effects? (Not sure how this would actually be used though)
- Fire
- Motion blur
- Electricity

All suggestions greatfully received!