For Dorkas Kaya and other young patients with HIV, seeing the walls of their residential treatment facility transformed with broad splashes of color and graffiti-like scribbles brought a singular reaction: "Whoa!"

Artist Jose Parla spent several days last week decorating bedrooms, hallways and common areas of the Incarnation Children's Center in his signature improvisational style, the latest project in a charitable effort that commissions top contemporary artists to make pediatric health facilities less intimidating.

"We were all like 'whoa,' yelling, 'cause it's so different," says Kaya, a 19-year-old who has been in the center for three years.