Hmm... indeed, I couldn't find anything of that nature. What is it you are trying to accomplish with the collection class other than just, say, excercise your Perl hacking skills? Are you simply trying to implement a standard collection class that has little use beyond academic circles?
I would really appreciate it if you could lay out practical reasoning to support the viability of existance of such a class. The fact I can't find anything similar on cpan (nor on google) is -- I think -- indicative somewhat of the fact that it's simply not needed?
Update: Of course, I should have mentioned that Perl arrays (along with the pop, push, and shift etc. methods) are in many cases sufficient means of handling a collection of one thing or another.
And if you ever wanted to add a capability to iterate through an array, just use the handy
Tie::Array::Iterable module.
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# Under Construction