WorldGen indicators allows you to generate extra blocks depending of existing worldgen. One of the common uses is adding prospecting flowers for ores that generate in the chunk. It uses craftweaker to make it possible.

Checking for any block in the chunk and generating a block in the surface

Generate at a define Y relative to the checked block
Generate at a define Y relative to the surface
Generate structures based on Minecraft NBT structure
Checkers based on the biome

First you need to create a BlockChecker by BlockChecker.create(1) where the number is the chance of getting triggered. Then you can add block to check to it with addValid(IBlock block) and Indicators with addIndicator(IIndicator indicator). The indicator can have multiple blocks added by the method add(IBlock block). (The indicators in the block checkers and the blocks inside of the indicators will be choosen at random)

Surface Indicator

The following script adds a 10% chance of adding a redstone torch in the surface when it finds a redstone ore:

import mods.worldgenindicators.BlockChecker;
import mods.worldgenindicators.WorldGenManager;
import mods.worldgenindicators.SurfaceIndicator;
import crafttweaker.block.IBlock;

var redstoneOre = <minecraft:redstone_ore>.asBlock();
var redstoneTorch = <minecraft:redstone_torch>.asBlock();
var surfaceIndicator = SurfaceIndicator.create().add(redstoneTorch);
var blockChecker = BlockChecker.create(0.1).addValid(redstoneOre).addIndicator(surfaceIndicator);
WorldGenManager.addChecker(blockChecker);

Relative Surface Indicator

The relative surface indicator needs a parameter in the create that is how many blocks above the surface will generate the blocks.

import mods.worldgenindicators.BlockChecker;
import mods.worldgenindicators.WorldGenManager;
import mods.worldgenindicators.RelativeSurfaceIndicator;
import crafttweaker.block.IBlock;

var grass = <minecraft:grass>.asBlock();
var glass = <minecraft:glass>.asBlock();
var surfaceIndicator = RelativeSurfaceIndicator.create(20).add(glass);
var blockChecker = BlockChecker.create(1).addValid(grass).addIndicator(surfaceIndicator);
WorldGenManager.addChecker(blockChecker);

Whitelist and Blacklist

import mods.worldgenindicators.BlockChecker;
import mods.worldgenindicators.WorldGenManager;
import mods.worldgenindicators.SurfaceIndicator;
import mods.worldgenindicators.RelativeSurfaceIndicator;
import crafttweaker.block.IBlock;
import crafttweaker.item.IItemStack;

WorldGenManager.addChecker(
    BlockChecker.create(0.5d)
        .addWhitelistEntry(<minecraft:sand>.asBlock())
        .addValid(<minecraft:gold_ore>.asBlock())
        .addIndicator(SurfaceIndicator.create().add( <minecraft:gold_block>.asBlock()) )
);

WorldGenManager.addChecker(
    BlockChecker.create(0.5d)
        .addBlacklistEntry(<minecraft:grass>.asBlock())
        .addBlacklistEntry(<blockstate:minecraft:air>.block)
        .addValid(<minecraft:iron_ore>.asBlock())
        .addIndicator(RelativeSurfaceIndicator.create(2).add(<minecraft:diamond_block>.asBlock()))
);

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WorldGen Indicators