[QuickSilver]

I use Nature's Miracle disposable "quick trainers" and am very happy with them. They are supposed to smell like grass, but they don't smell like much of anything to me, even after they've been used.

You can also try training your yorkie to pee/poop on command so you aren't waiting for 15 minutes in the cold. If she gets trained and knows she'll get a treat, she should go quickly, esp. if you only give her a few minutes to work her magic before you go back inside.