This has 4 folders. Three of them contain a big pipe tileset, and the best part: You can use 2 colors at the same time! Important: This uses multiple block IDs. And you can use one or both colors. That's up to you.
The other folder contains an unexpanded and small pipe tileset, but it has 14 available colors. It replaces the SMB3 and SMW default pipes.
Obvious note: You can recolor the pipes if you want, just don't make a mess. I just made some default recolors.