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Nice guesses, thanks for playing along. All are wrong at this stage.

curtain ?

Nope not a curtain.

That's the first thing I thought, that it's a patent leather purse. But I can see from the comments that it's not (a) leather, (b) vinyl or (c) a purse. :-)

I guess I better pay better attention to the comments :P

Is it ....... a sea shell ?

Its not a sea shell, a hint has now been added. :)

Jelly Fish !

Proof of the slug and Contest #4 is out now. I hope to see you there! :)