Supplementaries adds a variety of new items into your game. Many of these blocks can be used for decoration, while the other like the speaker block, hanging sign, etc have functions that will prove very useful to the player. Here's a list of blocks that I personally found interesting to play around with :

Wind Wane : The wind vane is a decorative & redstone block that will swing depending on the current weather in your Minecraft world.
Jars : Can store liquids and small mobs like vex.
Spring Launcher : Can be used to launch entities into the air.
Speaker Block : Can be used to send a message to all players around either through chat or through a narrator message.
Turn Table : This block can be powered to make the block on its face rotate. As a redstone engineer, I had a lot of fun experimenting with this block.

This is not all. There are plenty more cool blocks added by the mod. Download it using the links given below to check them out for yourself.

Also, the creator of this mod has done an amazing work with this mod. Consider supporting him on Patreon so that he can continue working on these mods for us.

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Supplementaries Mod