Take a look at messages used for Half-Life monsters. Attached is const.h from Botman's MonsterMod. I noticed a few "particle" type effects that can be accomplished, but I'm not sure exactly what kind of particle effects the plugin had, so I can't give you a specific message.
Keep in mind that these are all temp entities, so you would use them as following:
Code:
message_begin(MSG_BROADCAST,SVC_TEMPENTITY);
write_byte(TE_NAMEHERE); // make sure to define it
// ... all the other bytes and coords and things here
message_end();
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