A lot of people have suggested multi-colored torches, rails, ladders, fences, etc. and this is my take on it.
Having multi-colored torches and ladders might look ugly if you have to use two types of wood to build something. So here is an idea to fix that problem:
Wooden covers. A wooden covers are made by placing two planks of any color diagonally in a crafting table.
Basically, shears made of any color of wood. When you craft them, you get 4 covers per 2 planks.
A cover can be placed in a crafting table with any item that has wood visible in its texture to get the color of the cover you made.
Having multi-colored torches and ladders might look ugly if you have to use two types of wood to build something. So here is an idea to fix that problem:
Wooden covers. A wooden covers are made by placing two planks of any color diagonally in a crafting table.
Basically, shears made of any color of wood. When you craft them, you get 4 covers per 2 planks.
A cover can be placed in a crafting table with any item that has wood visible in its texture to get the color of the cover you made.