There are some pretty fun fanvids for Psych, including a couple by talitha78.

I admire the willingness to say "let's try THAT!" the showrunners/writers displayed, like, "let's redo one of our early episodes now that we have better skills!" and to literally have a character say "Shassie" onscreen.

(There's a bunch of Shawn/Gus fic in addition to the Shassie fic.)