Billboard help?

[FlawlessHappiness]

Making the colors of them much lower will help you

But the thing with the lines you can see... You can do that in the FG's maps too.
You just have to WANT to look for them.
A player wouldn't try to find all the flaws in your game, if you hide them. A developer would find them, because they know where to look. So if you want to see those lines, you're gonna see them.