Line colours
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 Is it possible to change the colours of individual lines? 
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 Yes. Go to your styles dropdown dialogue, > In model > Edit > Edge settings and there you can change the display mode from all same to colur by material. 
 Now you can paint your lines (only with colours of course, not textures).
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 Not having any success  Do I have to set different materials for each line? Do I have to set different materials for each line?
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 Shouldnt have to set material for each line. If you switch to wireframe mode it can make it a lot easier to paint the edges. Also, if oyu want to paint a few vertices the same colour select them all before you start, they should thne all be painted the same colour after 1 paint. Speeds thigns up a lot  
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 You can paint them with the paint bucket tool with any colour you want. It's just hard to "aim" at a one pixel wide line. Select the (even a whole bunch) first and then use the paint tool. Have you done the settings I told above? 
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 Sorted, thanks.  
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