I have had a favorite designer for booties and slippers for the last year. Her name is Sylvia Schuchardt - a mouthful, I am sure. Recently married, her last name is Heddwyn now, and that is a bit of a cotton-mouth one, too! She still uses her maiden name.
Anyway, Sylvia has awesome designs that she sells. I have made some and love them....she sells more than just bootie/shoe/slipper patterns, so take a look here! It is hookcandy.com - so check her out! I think she still sells at her Etsy shop and on Ravelry.
The photo is of a pair of slippers I made for my granddaughter using one of her Mary Jane designs. Love them!