That depends on what chapter you are playing. If you are playing ultramarines, use a high quality acrylic paint, Games Workshop paints are nice. If you use GW paints then base coat them regal blue, highlight the edges with ultramarines blue, paint the shoulder pads dwarf bronze then go over that with shining gold. Highlight the gold with mithril silver.
You can do it yourself, all you'd need to do is add a few spikes here and there, and then it's all up to how you paint it. If you paint on a few demon faces here and there, as well as the mark of Chaos, they'd be convincing enough to pass as Chaos Space Marines.
It depends where you are in situation: Melee Space Wolves Range Space Marines Psychic Space Wolves (only just) Vs. Vehicles/Light Infantry Space Marines Vs. Heavy Infantry Space Wolves Look Unpainted Space Wolves Paint Scheme Look Space Marines All-Round Space Wolves (I Reckon)
AnswerYes, it's good to be unique
AnswerNo it does not. You can paint Space Marines any color, specific colors are not claimed by chapters.
Umm...it's yellow paint...It was probably used for highlights on the space marines models for certain wargear.
Depends what you mean by the term hard to paint. Some Space Marines have some fiddly details but altogether I say no.
space marines cool because they hot before now they cool.
NO, Valkries are for the Imperial guard. Space Marines use Thunderhawk Gunships.
AnswerThey're just as old as the the Space Marines because 40k stated with Space Marines vs Orks.
Space Marine Tactical Squad (includes 10 Space Marines) Space Marine Combat Squad (includes 5 Space marines) Space Marine Rhino Space Marine Scout Squad (includes 5 Space Marine Scouts) Space Marine Assault Squad (includes 5 Space Marines).
The Space Marines, duh! My Theory is that in battle space marines but through Belief NOD you can never put NOD Down As long as Kane Lives and Kane is Immortal so NOD Will always exist plus Cyborg Commandos PWN Space Marines
The Space Wolves are Space Marines.The Space Marines are a genetically enhanced race of human beings and the Space Wolves are a chapter of these Space Marines.If you want to team up Space Wolves with another chapter of Space Marines, for example, Ultramarines, or Black Templars, you would have to check in the codex to see the rules that apply for allied armies.