My Paint Extras
Don

Allows you to paint dirt, gravel, wood, trees and more.

My Wood Slopes
Don

Make slopes with wood blocks.

Ethereal: All-faces tree blocks
1F616EMO

All-faces tree block for Ethereal trees

Zughy32 colored blocks
MisterE

Plain colored blocks from the Zughy 32 palette.

Columnia
mt-mods

Adds simple pillars and columns

Gates (wider)
Sokomine

Wide gates for easy walking through and keeping cattle inside

My Blocks
Don

Special Blocks

My Paths
Don

Dirt paths.

Tile Floors
ClassicAdam

Various colors of tile flooring in 16px and 256px res

Lapis Lazuli
LNJ

Adds lapis lazuli ore, items and blocks.

Better Ice
TheFanne

Modifies ice so that it melts into water when broken, and will be melted by torches

Parcdeco
Floatland

adds grass-like nodes that have flowers

New Horizons
Hi_World

Adds 4 new biomes and TONS of new blocks!

More Snow
Sokomine

snow and wool for stairs - nicer winter landscape and snow-covered roofs

Color Blocks
mt-mods

Contains colored building blocks.

Dyeable Steel Blocks
nemokitty9

Allows Players to dye Steel for decorative blocks.

WorldEdit Wall Block
SkyBuilder1717

Adds block and item for making big structures easily as possible.

Legendary Ore
DynamaxPikachu

Adds legendary ore and blocks

More Ladders
SkyBuilder1717

Adds more ladders and sticks!!!

Aquamarine
RasPiManiac

Adds Aquamarine ore, ingots, etc.

Stoneworks
TumeniNodes

Stoneworks simply adds some fun, and cool building options.

Glostone Building Blocks
Wovado

Adds basic glostone-based building materials

Rainbow Source
Shara

Adds coloured water.

Kotatsu Tables
Piezo_

Adds a new piece of furniture based on Japanese kotatsu tables

Mycorners
Don

Put decorative corners on blocks.

Ethereal Mosses
1F616EMO

More mosses for dirt types in Ethereal NG

Better Locks
SkyBuilder1717

Adds locks and locked doors

Saphire
Ryft77

Adds saphire stuff

Pink Lava
TenPlus1

Adds pink lava to certain depth of map with new mahogany obsidian block

Useful Contraptions
theFox

Some useful contraptions / machines.

Node houses
MatyasP

Node houses is a mod by MatyasP that adds one-node block of houses, for crafting using items from mode default.

Maple tree
Duvalon

Adds a maple tree placed during world generation.

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

Tac Nayn
GreenXenith

Adds Nyan Cat's evil twin, Tac Nayn (and a gray-scale rainbow).

More Mese Post Lights!
1F616EMO

Add more mese post light

Better Roads
DragonWrangler

allows players to make roads with less jagged edges

Colored Steel
cd2

Adds colored steel blocks.

Rotting Wood
Polynium

Causes wood to slowly rot while exposed to water

Floating Anchor
Starbeamrainbowlabs

ExtraUtilities' Angel Block for Minecraft in Luanti! Place structures in mid-air with ease.

My Mulch
Don

Turns leaves and other items to mulch blocks