Yes, a popular one involves the Grimm from RWBY showing up in Skyrim. The Dragonborn has to team up with RWBY characters to fight them off. It combines the combat styles of both universes really well. The fanfic also delves into how the people of Skyrim react to the RWBY characters' unique abilities and appearances, which is quite engaging.
Definitely. There's a fanfiction where the RWBY team is on a quest in Skyrim. They encounter various Skyrim factions and get involved in local politics. Blake's stealth abilities are put to great use in some of the sneaky missions, and Yang's strength is a big asset in battles. It's a great blend of the two worlds and their respective story elements.