I searched the name of the concrete block's color on Wikipedia to find the exact color codes to make them the proper color. These are also 1x1 textures so no detail just plain color. 1.13 and 1.14
I chose all rights reserved because I really do not know much about this but anyone may use this in their packs or servers and credit isn't necessary the only thing I don't want is someone just straight up reuploading and claiming as their own.