The Joan Mitchell foundation is one foundation that is making a difference:
"In the wake of the devastation left by Hurricane Katrina, in August 2005, representatives of the New York–based Joan Mitchell Foundation reached out to the arts community in New Orleans in an effort to help. After corresponding with individual artists and arts-organization leaders, says Carolyn Somers, the foundation’s executive director, “we realized that returning to the studio and finding a way to continue to make work following the flooding of the city” was a major challenge for New Orleans artists.
In September 2005, the foundation made its first emergency grants to artists who were adversely affected by Hurricane Katrina, and in the years since, it has provided more than $3 million in support to both individual artists and arts organizations in New Orleans. By 2007, the foundation had concluded that the city’s infrastructure for supporting artists, even before the disaster, was “fragile” at best." from Art News Magazine
Art in Public Place Supported by the Joan Mitchell Foundation New Orleans from google image