Okay, that didn't turn out as nice as I'd expected. Scratch the 'alien head' idea.
We just need something symbolic of alien activity. Any ideas? Maybe we could put an alien face on your flag instead, such as the alien face on the new UFOpaedia icon (this might be just the right size, in fact).
Ideas for the 'terror mission' icon:
Flag with a bloodied Kerrblade.
UFO crash site icon:
Some form of crashed UFO. Scout or Fighter would be best.
Also, is it possible to have animated icons, such as smoke streaming from the UFO crash site or PHALANX radar dishes turning?
Regards,
Winter