I've been having trouble to make these, since it's pretty hard to make a completely new pattern for pipes, at least for mine, it was pretty darn complicated to understand it. But after some effort and time I managed to make some custom pipes, hope you guys like it.
Making to do with recolors is supposed to be simple but making them all by yourself is another story. You did made a good work on those pipes. No flaws that I can see so you did it nice.
Those look pretty neat actually, but the shading doesn't go well with SMB3, in my opinion (the colors and shading don't fit well with SMB3's more vibrant and slightly simpler style), which makes it look a bit weird. Nice job, though! I believe they could work well with some custom GFX.