WALNUT CREEK, Calif. — Nicole Leigh Smith and her man were at their Montana ranch, where he was moping with his right arm in a sling, thanks to recent surgery.

WALNUT CREEK, Calif. — Nicole Leigh Smith and her man were at their Montana ranch, where he was moping with his right arm in a sling, thanks to recent surgery.

Before making the long trip to the nearest grocery store, she encouraged him to find something to do — a rare request of a guy with Jason Newsted's frenetic energy.

"I sensed he was a little down," Smith says of that 2005 day that changed Newsted's life. The former bassist for Metallica, Voivod and Ozzy Osbourne finally had his right shoulder fixed after decades of wear-and-tear on stage, and he wasn't used to resting.

"I said, 'Why don't you paint today?' " Smith recalled. "And he said, 'Paint what?' So I set him up and said, 'I'm going to be gone all day — go crazy.' "

Smith, an accomplished artist herself, came home eight hours later to find her boyfriend — and much of the room — covered in paint.

"We still haven't got all the paint off the carpet," she says." He was like. 'Thanks, Nic, that was awesome.' I was like, 'Oh God, what have I done?' "

What she did was launch a new chapter in the artistic career of Newsted, now 47, who's come a long way since Montana. His work, which he describes as self-taught contemporary American art influenced by Pablo Picasso, Jean Dubuffet and Jean-Michel Basquiat, hangs at the Micaela Gallery in San Francisco until June 27.

"I dove in right away," Newsted says in his Walnut Creek studio, the former home of his next-door neighbor now bulging with giant stacks of paintings — about 600 in all. "It's lemons to lemonade, man. I couldn't do what I was meant to do (play music). It was emotionally devastating — having to sit in the same spot for two hours."

After that first messy day, the burgeoning painter was banished to the barn

By his own admission, Newsted was "whacked out on painkillers" and his initial method wasn't much different from his style of bass-playing: seriously aggressive. It encompassed a lot of slinging paint onto a target, which he says was necessitated by his bum arm.

Being right-handed but having to paint left-handed made painting not only therapeutic, it altered his body routine and, perhaps, stimulated his brain in new ways, if studies are to be believed. Either way, Newsted found a new creative purpose.

Painting wasn't entirely foreign to Newsted, who grew up on a Michigan farm working with animals, painting and learning public speaking (for which he won a state competition at age 12).

"It became dogma — a painting style out of necessity," he says. "The most powerful reason I do it is that I step back from the canvas and say, 'I had no idea that was in me.' Some of the first ones were the best. It was just childlike wonder."

He joined Metallica in 1986, only weeks after the death of bassist Cliff Burton, beginning a whirlwind decade-and-a-half when the Bay Area thrashers became one of the biggest bands in the world. Newsted's departure, chronicled in the 2004 film "Some Kind of Monster," was prompted by the band's restriction on outside endeavors. He felt creatively stifled to the point of bailing out.

Things definitely have changed for the bassist, who used to say his music was so important that he couldn't imagine having children. He now admits fatherhood could happen "if I can trim down the empire; if it's the right thing."

But, for now, art is still the focus. And he thinks he has his first buyer lined up — the same connoisseur who once set a record for fetching the biggest price for a Basquiat.

"Lars will buy one," he says, adding that he was "flabbergasted" by the Metallica drummer's appearance at his opening. "That was a big feather in the cap. I actually want to do a piece for them. I have to go over and check out their house again and see what I can do"

Ulrich would be smart — if he doesn't want to replace the carpet — to have his old friend paint it in the barn.