Today I received some silver building blocks from forum member @OlliesSilverBars.
Recently I posted that I had bought some blocks made by Monarch, but was a bit disappointed that they don't interconnect with real Lego bricks. In another thread someone mentioned that Ollie's bricks do, so I bought some to test that out for myself.
As the pictures below show, the bricks arrived nicely packed in little black bags, and are the same size as standard 2x4 Lego bricks. They even have the tubes underneath that give Lego bricks their "clutch power" but on the silver bricks they aren't full size. But they do indeed stack with real Lego bricks so it's possible to make a structure mixing up the silver and actual Lego. Being hollow, the bricks are lighter than the solid 1oz Monarch blocks.
Of course, the presence of such treasure inevitably draws attention from the criminal fraternity, although small-time criminals are likely to make blunders when in pursuit of their nefarious activities that are likely to bring them to the attention of the law. Better hope the king is feeling merciful...