Wait...the person who bitches when people use flyers against him used flyers against you? Learn something new every day...
i hate chaos flyers too :P and i use order flyers (no but seriously i have no problem dealing with order flyers, its the chaos flyers that's annoying).
order giant upgrade: resource management education - cost 600-200, order giants can now slam his arms down dealing AOE damage with his chains(he can still throw boulders if he wants).
order and chaos upgrade - pick axe throw: the miners recieves boomerang educations - costs 50-50, can now throw their pickaxes (or hammers) at flying units to deal moderate damage.
crawler upgrade - feeding frenzy - if a crawler kills a unit, he gains full health - costs 50-100, very long research time.
Medusa upgrade - eye for an eye - after death, she explodes into a pool of acid dealing insane damage to a SMALL area around her, costs 500-500
ghost control - allows u to control ghost spawns, no research, however every command u give the ghost will cost u 10 gold.
ninja upgrade - Kunai throw, its a toggle like the the dead's poison, ninjas throw kunai at 4/7 the range magikills cast. costs 50-0 to research, it costs 5 gold to throw a kunai, double the ninjas' melee attack rate but fixate does not affect this abilities damage(same as the ninja's first strike).
combine shield wall and shield bash into one upgrade. add spearthrow to spearton-costs 50 mana to research and cost nothing to use, 2/3 of magikill's cast range and deals 2.5 damage. but once used he switch to a dagger that does 1/3 of his original damage.
make tower spawn 3 levels, the first lvl should cost 100-200 and spawns a 2 sword/ 3 crawlers.
skull mage upgrade - fake death - cost 0-100 to research and 25 mana to use, once used the skull mage can't take damage but also can't move or attack or anything for 2.5 minutes he collapses into a pile of broken bones on the ground for the duration(after that time he reassembles him self with full HP).
magikill upgrade - silent casting - costs 50-0 to research and takes a LONG time to research, once researched, he casts spells as usual at the same speed, BUT he utters no words.