Well, if you mean sketches like drawings, you should go to the Fan Art section. Stories and such, yeah, they can be posted here.
If by sketches, you mean random and/or humorous literary scenarios, then yes, those are fine here as well.
As for content, try to keep it PG-13.
My Stories
Look at that. A full-grown woman pulling off pigtails. Her crazy is off the charts.
Thans Mr. Grey--just what I needed to hear.
I've been watching and I see RP games and vignettes as well as some sketches and stories (some even serialized). So, are all of these generally accepted here? Is this the place for stories, sketches and vignettes?
Thanks.