Grooved is used in Mechanics, I think..

In Architecture they say channelled or fluted (e.g. a fluted column).



--------------------------------------------------
Note added at 40 mins (2005-08-26 17:51:25 GMT)
--------------------------------------------------

Corrugated should be "gekraeuselt".. ;o)

Also other websites, this sounds comfortable, like music
Lamata Contract Furniture: Opera chair, lightweight aluminium chair. ... Fluted aluminium frames combined with metallic hammerite finishes offer attractive ...
www.lamata.co.uk/products/ hotel-banqueting/opera-chair.php

-

--------------------------------------------------
Note added at 1 hr 9 mins (2005-08-26 18:20:05 GMT)
--------------------------------------------------

@Edith:

Fluted disk offers a classic form of elegance. Its corrugated aluminum ring is precisely cut to hold a piece of round sand blasted glass with polished edges. The diffuser locks into place with a quarter turn of the corrugated form.
http://www.brandlighting.com/contemporary_close_to_ceiling_f...

Forms + Surfaces

Known for transforming everything from elevator cabs to space dividers, Forms + Surfaces looks up. The Contour lighting series is the result. The fixtures are constructed from Aero, a corrugated aluminum material also available in sheets for a variety of coordinating applications.
http://www.interiordesign.net/id_article/CA301866/id?pubdate...

If lace doilies and chintz comforters aren't your thing, consider spending the night with Picasso instead. Located just two blocks from the main square, the Duchamp is an austere monument to modern art, a slick habitue for the wallpaper* set, with suites that honor the masters of cool: Man Ray, Miro, Warhol and, of course, Picasso himself. You'll find plenty of eye candy in the form of cowhide rugs and blonde wood desks and slate grey bathroom tiles, as befits a pair of swank hipsters such as yourselves. If you'd rather snooze sans Marilyn or the sultry neon lips, you're in luck: in addition to the aforementioned suites, there are eight theme-free villas trimmed in corrugated aluminum with cool concrete floors and fuzzy lambskin rugs, with enormous bathrooms to boot. A long, narrow table graces the entrance building, with leggy chairs arranged around it, complete with a menu of wines by the glass and exotic teas for when you need a little something to get you out the door. A rectangular lozenge of a pool sits in the center of the compound, looking particularly spectacular at night, when bluish lights from beneath the water cast a surreal glow on the entire deck. So go ahead: slip on the Pradas, grab the Gucci and your sleek, chic honey and make like the city-worn jetsetters that you are. Ice, ice, baby.
http://www.sexandthekitchen.com/destinations/healdsburg/best...

Many dictionaries say riffeln = ripple, but in the case of textiles.

However in the context of your source text, I think 'rippled' sounds appropriately cuddly. See the URL.