Rudimentary Random Level Generation in Unity

public GameObject blockType; //set this to a prefab in the editor

int objectsCreated = 0;

//Loop this whole thing until we've created as many blocks as we want
while (objectsCreated < desiredNumberOfBlocks) {

    //Pick a random position within some limits
    float blockX = Random.Range(leftLimit,rightLimit);
    float blockY = Random.Range(levelHalfHeight * -1,levelHalfHeight);
    float blockZ = levelDepth;
    vector3 blockPosition = new Vector3 ( blockX, blockY, blockZ );

    //Create the block at that position and remember its name
    GameObject block = Instantiate(blockType, blockPosition, Quaternion.identity) as GameObject;

    //Pick a random size within some limits
    float blockWidth =Random.Range(5,maxBlockWidth);
    float blockHeight = Random.Range(5,maxBlockHeight);
    float blockDepth = Random.Range(5,maxBlockDepth));

    //Make our block that size
    block.transform.localScale = new Vector3(blockWidth, blockHeight, blockDepth);

    //Note we've made another block, loop
    objectsCreated = objectsCreated + 1;

}