The "Live-It-Up-Look," with black ceilings, metal tiles and upholstered walls, a strong swing away from the cozy "Just Folks at Home" design of recent years, seems to be a strong undercurrent among Washington interior designers.

The best of the interior designers have always tried out what is called "drop dead decorating" in their own homes. Then they can keep a straight face and say "yes" when the client asks, "But could you live with it?"

A chance to see such dramatic designs, and maybe steal a few, will be offered during the house tour of the Potomac Chapter of the American Society of Interior Designers from 10 a.m. to 4 p.m. Saturday.

Shown here are three of the seven tour homes. Arlence Golub luxuriates in her contemporary family sitting room, converted from a two-car garage in her Rockville home. The old picture window from the dining room replaced the garage doors. The walls were upholstered with dark, almost black/brown vinyl, also used for the vertical blinds. (The antique porcelain stove blew up the first time it was lighted, so now it is for display only.) The floor is ceramic tile made to look like brick. The leather furniture is from Atelier International.Golub has her own firm.

Gary Lovejoy's Connecticut Avenue one-bedroom condominium has a wood cylinder wrapped with silver wallpaper and topped with glass. He had the curving storage wall made to solve a difficult angle. The step-down living room has black walls to accent the elaborate white plasterwork, a relic of the apartment's beaux arts past. Lovejoy is with S.D. Jeffery Associates.

Lawrence L. Becks of Designers Consortium remodeled an almost-new builder's house in Potomac to make a dramatic setting for his family. He and his wife did all the painting, hammering and tile-laying. The floor is actually flexwood, a paper-thin wood usually used to decorate columns and walls, left over from an office decorating job. Here it is covered with polyurethane for durability.

The cylinders, which look like Lovejoy's, are actually storage drums covered with mylar and topped with a glass rectangle. (Both versions are infinitely cheaper than the high-priced chrome cylinders.) The sideboard is made of ceramic tile shipping crates. The silvery wall in the foregrounds is made of metal tiles from Forms and Surfaces of California, also a leftover from a job. Now the Becks are building a huge deck all the way around the house.

Others whose homes are on the tour are Stephen Jeffery, head of S.D. Jeffrey Associates; Robert E. Waldron; Joanne McLellan of Walsh-McLellan Interiors; and Ethel Armstrong. Ticket information is available from Jean Maxwell at 652-8313. Profit from the $7 tickets ($8 on tour day) will benefit Gadsby's Tavern in Alexandria and the ASID Educational Fund.