Loki:
you can just paint normal dwarfs in a dark colour, dark reds are good for this, start by removing as much of the standard dwarf signs as possible ie the designs on the shields, the runes on the weapons.
If you want to do some converting with out using green stuff some simple axe swaps with warriors of chaos work really well for this and you can create blunderbuss buy gluing the small round shields that you get in the standard dwarf warriors box on to the end of the thunders guns and bobs you uncle a great looking unit of blunderbuss.
Here is a link to my army blog, https://discourse.chaos-dwarfs.com/t/9189 near the bottom of the 5th page is what the blunderbuss look like, all on the 2nd pages are my unit of warriors and you can see the basic axe swap, the miners from the bfsp set make great warriors with great weapons 
Hope this has helped