Meh, lots of stuff:
cuddling with my blanket ^^
oh, and I Macgyver stuff, like, I'm working right now on selecting a belt to make a collar. ^^ I want to make my own, kickass collar, cause I've always wanted one, but was always to stupid to buy one, or I was with my friends, and I'm a shy fur.
Interesting enough, I have begun this habit too, don't know why, but I scared my mom with it, because when I do it, I clack my teeth together when I close my mouth, cause thats how my dog always did it. :-D
I dunno, the "furry" things I do when I'm bored are about the same as the non-furry things I do: surf the Web, watch TV, play with my cats, dream about going back in time with advanced technology and using it to conquer the world & rule it with an iron fist.
With the exception of playing with my cats (which is furry by definition), every one of those activities can be done within the context of the furry fandom & outside of said context.
Play around in my fursuit and randomly dance. Practice spinning on my turntables in and out of suit (its always a fun to see what new transitions i can come up with. Talk with some other FAF members on the phone for 3+ hours and play with my dog.
As a writer/artist in the middle of writing & illustrating a massive novel, I do what every writer does when bored and with free time: I stare at the computer screen and graphics tablet playing solitaire instead of getting anything done.
Other than the typical: browsing FA, wasting time here, and drawing some furry art or looking at it; not much really. I think about when I can go to another furcon at some point. My Halloween costumes that I make myself tend to be furry in nature, but that was even before knowing what a furry was.