Dyes for leather http://www.tandyleatherfactory.com/en-usd/home/department/leather-dye/leather-dye.aspx you kind of swab this on leather with a q-tip like utensil
As for metal it would be simalar to something you paint on etc.
And for making fabric they can use this as a reference: http://www.weavingworks.com/SearchResults.asp?Cat=88
First you comb that dirty fiber then you spin it into thread/yarn and then you add it to a loom or you crochet it into something nice.
Patterns can be found then learnt or created depending on knowledge. Patternmaking would be awesome in creating wonderful new desings either based on old ones or just something new!
Bethesda can also introduce some WONDERFUL fabric painting, that would be awesome!
