Features:

Use cauldrons to convert concrete powder into concrete without all the hassle of placing and breaking any blocks. Simply drop your powder (press Ctrl+Q to drop an entire stack at once) into a water cauldron, wait a few seconds, and instantly get your concrete conveniently converted for you.

This not only saves your players valuable time, but makes concrete a much more accessible building material. Players with technical know-how won't have to deploy potentially laggy redstone machines just to generate large quantities of concrete anymore.

Respects land claims.

Players will only be allowed to use cauldrons they have access to.

This plugin natively supports claims/regions from the following plugins:

GriefPrevention
WorldGuard
... and many more! (depending on if they cancel cauldron-related events)

Configurable effects.

By default, the concrete conversion process plays various splash sound effects & particles.

These can be changed or disabled in the config.

Config:

Default Config (v1.2.0)

# ConcreteMixer v1.2.0
# Throw concrete powder into a cauldron, get concrete!

meta:
  # Please do not modify this value (it's used to update the config).
  config-version: 1.2.0
plugin:
  # Can the plugin submit anonymous usage metrics to bStats?
  # https://bstats.org/plugin/bukkit/ConcreteMixer/15590
  # (Global bStats settings can be found in: /plugins/bStats/config.yml)
  metrics: true
  # Can the plugin check for updates?
  # If an update is found, a notification will be sent to console.
  check-for-updates: true
cauldrons:
  # If enabled, players must have access to the 'concretemixer.cauldrons'
  # permission node in order to create concrete with cauldrons.
  require-permission-node: false
  # Should the cauldron's water level be lowered after successfully creating concrete?
  lower-water-level: true
effects:
  # Toggle all effects.
  enabled: true
  splash:
    particles:
      enabled: true
    sound:
      enabled: true
      name: ENTITY_GENERIC_SPLASH
      volume: 0.75
      pitch: 1.0
  transform:
    particles:
      enabled: true
    sound:
      enabled: true
      name: BLOCK_FIRE_EXTINGUISH
      volume: 0.65
      pitch: 1.25

Metrics:

This plugin collects anonymous usage metrics with bStats. If you would like to opt out of metrics collection, it can be disabled in the config. Click on the graph below to visit this plugin's bStats page: