This Addon adds Lego blocks that you can use for deco or scrap blocks since they don't drop themselves and are pretty easy to get, at least with the dlc I made for it :))) so if you just want this you'll have to stick to the /give command, if you want it to be survival friendly then download the dlc
A very simple addon that adds the basic colored Lego bricks(11) Here Are Screenshots of the addon the blocks next to each other (I forgot to have the other 3 in the picture) here are the Legos places down, as you can see they have a custom model, the Lego box is right there(download the dlc to use it) the bottom view of the Lego blocks