Flat Lights requires Curios to be installed. (Note: Flat Lights for 1.16.5 requires Curios v4.1.0.0 or above to be installed.)
Flat Lights is also available on Modrinth!
Find the mod wiki here for more in-depth details.
Flat Lights is a mod that adds a variety of decorative lighting blocks as well as some unique tools and enchantments. The blocks have very simple textures and are available in the 16 dye colors of vanilla Minecraft, as well as 16 alternate colors available through crafting. Recipes for these blocks are all very cheap since the main purpose is just decorative lighting blocks, and nobody wants to grind for building materials anyway.
There are different variations of the blocks with different patterns, as well as plain, flat textured blocks if you are just looking for color and nothing extra.

There are 16 alternate colors that can also be used in the same block patterns as the vanilla dye colored blocks.

Flat Lights also adds some partial blocks that can be used, again available in the 16 dye colors and the 16 alternate colors. These blocks are able to be waterlogged and directionally placed as well, perhaps useful for interior lighting or making neon signs.

The lights can also look nice with shaders applied. (Complementary Shaders used in this image via Oculus, tweaked such that the blocks have emissive properties similar to the Redstone lamp blocks)

Aside from that there are a some extra items and blocks in the mod not related to building, mostly for fun and utility. Those aren't too important though, the main focus is decorative lights.

*If someone finds this mod and wants to use it in their modpack, sure go ahead.*