take 1 pound, defrost, and make portugese style gambas al ajillo. blend 1/4 cup + evoo, 1/2 cup onion, 1 head of garlic, and 1 tbsp of salt until it's a thin paste. place shelled/deveined shrimp and marniade in a zip lock, and let it marinate for 4 hours. wiithout wiping away marinade, cook shrimp for 3 to 5 minutes in another 1/8 cup evoo that been heated until it's just about smoking until they are just opaque throughout. not too long or they'll get tough.
for the second pound, make shrimp fra diavolo. to a deep saute pan over medium heat, add 1 large can of whole san marzano tomaotes that have been chopped or crushed well. in a seperate skillet, brown a cup of diced onion; add to tomatoes. add a good tbsp of crushed red pepper flakes and a pinch of dried oregano, and let the sauce simmer until thickened, about 20 minutes, stirring occasionally. when the sauce is ready (good and thick as the shrimp will release some liquid thinning it out a bit), add a hefty handful of chopped or torn fresh italian basil, and the defrosted/shelled/deveined shrimp. once again, cook for only a few minutes, stirring a few times, until the shrimp are opaque throughout. you can add some calamari rings and bay scallops to make the dish more interesting.
the third pound should be shrimp cocktail, as cooksie mentioned. boil a few quarts of salted water with a lemon that's been quartered. add defrosted shrimp, this time deveined but with shells intact, for 4 minutes. again, until just opaque. once shrimp are cooked through, quickly drain and rinse with cold water until they don't feel hot anymore. place in bowl in fridge until ready to serve. you can serve them peel and eat, or shell them just before serving with lemon wedges and a 70/30 mix of ketchup and grated hot horseradish.
send me the fourth pound as a thank you for the great ideas...