FLC OF A B757 ACR ACFT FORGOT TO SET THE FLAP SLATS FOR TKOF RESULTING IN AN ACFT CONFIGN WARNING DURING TKOF ROLL. TKOF WAS ABORTED.

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PIT-LAX; JAN/TUE/94 B757-200 LAX CREW. WE PUSHED BACK FROM GATE 27 MINS LATE DUE HOLD FOR CONNECTING PAX. CREW HAD STARTED DAY IN PITTSBURGH AT XAAM PDT. WE HAD ALREADY FLOWN ROUND TRIP TO DCA WITH ACFT HAVING TO BE DEICED AT PITTSBURGH. NO SNOW OR ICE HAD ACCUMULATED ON WINGS FROM DCA-PIT OR WHILE ON GND AT PITTSBURGH; THOUGH WX HAD SNOW FLURRIES ALL MORNING. RAMP HAD FULL SNOW COVER WITH PATCHES OF ICE SO WE DECIDED TO KEEP FLAPS UP UNTIL PAST DEICE PAD IN CASE WE NEEDED DEICING. I CANNOT RECOLLECT IF WE ACCOMPLISHED BEFORE TKOF CHKLIST AS TAXI OUT LASTED 30 MINS. WE WERE CLRED FOR TKOF. I COMPLETED THE BELOW THE LINE ITEMS; AND THE CAPT ADVANCED THE THROTTLES. WE RECEIVED A CONFIGN WARNING LIGHT; ADVISED THE TWR WE NEEDED TO EXIT RWY AND PROCEEDED DOWN RWY TO EXIT. SET FLAPS; WE TAXIED BACK AND COMPLETED A NORMAL TKOF. CONTRIBUTING FACTOR WAS A CREW WHO FELT VERY COMFORTABLE WITH EACH OTHER; HAVING FLOWN THE MONTHLY SEQUENCE TOGETHER AND WORKED EXTREMELY WELL TOGETHER. OUR CHKLIST AND PROCS WORKED EXTREMELY WELL TOGETHER AND THERE MAY HAVE BEEN SOME COMPLACENCY. ALSO; AIRLINE LIKES TO GIVE WEST COAST CREWS THE BULK OF 'RED EYE' FLYING AND EARLY GET-UP MAY HAVE CONTRIBUTED TO EVENT.