Are there speakers with cloth/soft enclosures instead of wood?

Maggies! 

Don't forget Vandersteen 4's. All you see is the top & bottom oak caps & that big black sock wrapping 95% of the speaker. 

I've seen pictures of the Vandy 4s sans sock. Very odd looking thing: a very strong central tower of various speaker enclosures (black MDF) attached at top & bottom.

Magnepan, Vanderstein, Dalquist, Thiel, Heil, Ohm all made(make) speakers at least partially covered by fabric (although all but Magnepan,  Quad, and Dalquist had boxes for some of the drivers.)  Going back even further, Stu Hegeman had a partial fabric covered speaker sold under the Eico and the Harmon-Kardon labels.

Back in 1980 I made speakers for my basement, one of many systems I have. The tweeters and mid-ranges drivers were placed in spherical polystyrene bead board enclosures. The eight-inch woofers were in hollow spherical enclosures made from particle board and covered with 1/4" felt. I suspended these six time-aligned speakers from the ceiling using ropes. For the sub woofer I built a "big foot" with a 15" woofer from an article in Audio. It is the size of a refrigerator and I laid it on it's back. It was electronically crossed over at 45 Hz. I still listen to this system and have a Yamaha PSR 190 keyboard hooked up to it. The six speakers use a custom-made passive crossover from recommended parts I got from Bob Ludwig of St. Louis. I currently drive the six speakers with a McIntosh 2300 solid state power amp and the sub with a Hsu class AB sub amp rated at 250 W per channel. The spherical polystyrene bead board enclosures used for the tweeters and mid-ranges are quite non-resonant. The system sounds well balanced.

Gradient Revolution, at least partially.