Rake through your old toy box, pop down to your local charity shop or beg some kids you know for 8, or so Lego blocks.
Take a block and holding it in place, carefully drill two holes through it.
Now, here's where you can get clever. Take two more Lego blocks and attach them on top of the block with the holes, so that the fronts of the top two blocks are sticking out.
Place a fourth brick on top of the drilled brick, by attaching it to the bottom of the top bricks. Placing the drill through the holes on the drilled brick, drill through the new brick. Flip the brick over and drill back through the new brick, to make the holes neat.
Repeat this and drill holes through the remaining bricks. Cut two strands of elastic thread, slightly longer than the circumference of your wrist.
Slip the two strands of elastic thread through the two holes on a Lego brick.
Slip two beads on to each strand of elastic.
Attach another brick and some more beads.
Continue this until you have attached all the bricks and beads.
Tie the two ends of both string of elastic together and you're bracelet is ready to wear.