Jusst about any chapter. Ultramarines, Crimson Fists, and Salamanders are all super-popular these days. Raven guard are well known for their scouts, as are a few other chapters that my brain just refuses to think of right now.
EDIT: Right just checked the poll. Close combat scouts are very big for Black Templar, so those colors might work as well. Dark Angels and Imp Fists are a little..old and straightforward for scouts if you ask me, so I'd avoid those.