NEW YORK — The 1970s were an eclectic time for decor and design. Mirrored disco balls, beaded curtains, plastic furniture and chrome — lots of chrome — were hallmarks of the decade, but it actually boasted a wider range of styles that extended to avocado-colored appliances, coral-colored furniture and shag rugs. Some 1970s styles, such as flared jeans, need never come back, but many of its better design aspects have re-emerged.