Hey there. I have what they call a Morkie. Tia is 1/2 Maltese and 1/2 Yorkie. Quite a few sell this mix as a "Designer Dog." Please, don't be fooled. It's just a fancy word for a mutt or as I prefer to call her and others like her a "Mixed up pup." The lable them with the word designer and charge and charge high fees for a pup you can easily find in rescues, your local humane society or better yet
www.petfinder.com. Don't buy into all they hype. If you truly want a mix then buy it as a mix and check out the humane societies or petfinder.
In so far as look goes. Tia is in my avatar. She is light colored girl laying next to Bella my full Yorkie. She is champagne in color and weighs just a bit over 4 lbs. full grown. She's beautiful and has a calm disposition. BUT with that said let me also say that there is NO GUARANTEE what you will get with a mix. This same mixture (Maltese and Yorkie) can look very different not only size wise but also just the look itself. NO ONE can guarantee what ANY mix will look like and a lot of times the pup may look one way when they are young and grow up to look totally different as they mature.
Welcome to Yorkietalk and I wish you the best
Elaine