Drawing five Lewis structures for the perchlorate ion ClO4-

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I'm asked to draw 5 possible lewis dot structures for this ion. But I can only think of one. which I 've attached here. I'm supposed to draw them and determine which is the most favorable. I know I can do that by calculating hte formal charges, but first I need to draw these structures. Any suggestions?
 

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physicsss, the provided structure is usually referred to as a charged octet. By using double bonds instead of single, you can reduce the charge separation at the loss of an octet. There are several compounds which have non-octet structures so feel free to violate that rule (but realize that it comes at a cost, in terms of stability).
 
Yes,most elements in their highest oxydation states will not obey the octet rule.Linus Pauling thought of a method of solving this problem of overabundence of mesomeric states by inventing the so-called "dotted chemical bond"...

Daniel.