uhh!!! !TCHCSHCHSHCHSC! burns my yaay sense
k.. here's another idea :
Acid Tower
Each attack reduces the armor of unit and deals damage overtime.
Now this is getting typical
woot, corrected
stop double posting,edit your other post
)More, more and more ideas
Electric Tower
Has % chance to create a Thunder Clap at target unit's location (done by dummy unit)
So if the skill procures, create a dummy unit at attacked unit's position and order it to Thunder Clap.
This idea is gotten through reading Ozaru's
EDIT: Agree with Ozaru. You already have negative reputation so you should stop Double Posting or you may make some Moderators angry and ban you. Edit your post just like this
Edit : Will not just cant follow ur ideas, u post em so fast! while editing im sure 10 more ideas has popped up got a lot to do 
A Teleport tower, with very small damage, and an ability that can target one of your towers. When you use it, it sets that tower as the destination. Then, your teleport tower has a passive chance to instantly teleport any unit that it damages directly to that tower.
No upgrades.
Nah... dont think
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A Time Stop tower, with an ability that freezes all nearby units (including your own, and the time stop tower), but drains the mana of the tower. When the tower runs out of mana, or you click unfreeze, all units in the area move X% faster for Y seconds based on how long they were frozen (to rebalance the space/time continuum). Any units which move into the time stopped area are frozen.
Upgrades to a Time Rip tower, which keeps the time stop ability, but also gains the time rip ability, which is an AoE ability that instantly removes all enemy units in the area. After a random (.01 to 360) number of seconds, the units will reappear nearby, taking X% damage. They could either all come back at once, or, they could each get a time to come back (one could come back after only .4 seconds, while another is gone for 5 and a half minutes).
OR
Upgrades to a Recursion tower, which keeps the time stop ability, but also has the recursion ability. When cast, the AoE ability marks all enemy units in the area with a recursion effect. After X seconds, they are instantly teleported back to their original locations (when the spell was cast), and each does area damage to nearby enemies (their allies).
Sounds good... just need to help me with it tho
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A Soul tower, with an effect (like searing arrows), that uses 1 mana every time it attacks. It has negative mana regeneration. When a unit dies next to the tower, or if the tower kills a unit, it gains mana. Without the effect, the tower does very little damage. With the effect, the tower gains damage, and has a small chance to instantly kill any unit it damages.
No Upgrades.
If you help me
E - Periodic Event 0.2 sec
C - Unit got buff (Spread)
A - Unit Group - Pick every units in (100 range of triggering unit) and do actions
Loop Actions
Order Spread Dummy to Attack Picked Unit
Wait till condition
C - Attacking unit = Spread Dummy
Unit - Remove Spread Dummy
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