Orange dye can be made by putting yellow dye (from crafting yellow flowers) and red dye (from crafting red flowers) on the crafting table.
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You can make blocks out of it, for building with, it can also be used as a dye.
There is no 'brown dye' - to dye wool brown, you just place it along with Cocoa Beans into your crafting slot, to make Brown Wool.
You simply take normal goblin armor (from maybe lumbrige) and get some orange dye and dye it orange. Go and speak to the whitch in dreynor and she can make you dyes if you have the right ingredients.
You have to put a cactus in a furnace and then apply the resulting dye to the wool.
Find a rose (a red flower), click it to remove it, then put the flower in a crafting table. The result is red dye.