"Needle in a Haystack" - Similar phrases?

Question:Can anybody think of some similar phrases to "a needle in a haystack"?

Please list them

a drop in the ocean
a grain of sand in the beach
the end of eternity
between the devil and the deep blue sea
i dont if this is right but some moron/idiot say hay in the needlestack or maybe stick in the leafstack lol
"a fart in a sand storm"
you'll have more luck fitting a camel through the eye of a needle.
Haha i am i shopaholic so i'd say finding a Dooney and Bourke purse at Walmart.

or you could say like finding a prep in compton or something like that (and don't get made if you actually ARE a prep in co mpton reading this! LOL )

Just think of like opposite things.
Needle in a haystack if most often used when someone is looking for something that which is difficult to see to find. Such as trying to find something that's green on a grassy field. Very difficult to see and therefore difficult to find.

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