These are the places I go to first on DA for stock and they have the best and most lenient stock rules!!

Awesome premade backgrounds: [link]
More 3D stock: [link]
Awesome 3D people: [link]
Great photography stocks: [link]
More great 3D renders: [link]
Best face set I have seen yet: [link]
Great 3D dragons: [link]
Great architecture photography stocks: [link]
BEST hair stock: [link]
Excellent 3D stocks of every imaginable kind: [link]
Everything GIMP-brushes,patterns etc.: [link]
More great 3D stocks: [link]
Great Brushes: [link]
TONS of awesome stuff here: [link]
Great stocks: [link]
Great people stock photography: [link]
More great photography stock: [link]
More great backgrounds and great brushes: [link]
Great brushes: [link]