If you want to see a video tutorial for plaid nails, I pretty much stole this from Nails by Asami. I just thought the look would be perfect.
Now that I've done plaid nails I can say that I like them. How about you, have you tried them?
Whoops, forgot to mention what color I used (thanks peripatetic33). American Apparel Factory Grey is my base, the white and black stripes are Stripe Rite and I actually started using the bright green Stripe Rite for the green but it didn't pop enough so I went over it with Finger Paints Guggen I'm Lime (love that name).