It's a simple idea, the LEGO group would release annual "parts packs" of a large variety of bricks in a single (rare) color. Basically a chance for enthusiats to acquire a large number of a particular color bricks at a lower cost.
Some suggested colors:
Sand Green, Dark Red, Sand Red, Earth Blue, Sand Blue, Earth Yellow, Brick Yellow, etc.
Parts Packs would consist of approx. 250 parts and would include:
1x1, 1x2, 1x3, 1x4, 1x6, 1x8, 1x10, 2x2, 2x3, 2x4, 2x6 bricks
1x1, 1x2, 1x3, 1x4, 1x6, 1x8, 1x10, 2x2, 2x3, 2x4, 2x6, 4x4, 6x10 plates
1x1, 1x2, 1x3, 1x4, 2x2 tiles
2x2 corner bricks and plates
I'm sure I'm forgetting lots of important pieces, so leave comments with parts and colors you think are important.
I'd expect each parts pack to retail for about $30-$40 USD.