Ravelry: 111-29 knitted slippers in ”Eskimo” pattern by DROPS design
Here is a free pattern for non-felted slippers you can knit. Making them with colored yarns that suit the person you make them for gives them personality
Sideways SLIPPER BOOTS with Options by Kriskrafter1 on Etsy, $5.25
Pom Pom slippers - Loveknitting blog
Free Knitting Pattern for Grown-Up Garter Booties - Maria Sus designed these garter-stitch slippers that are shaped with short rows. Great for multi-color yarn or stash-busting!
Thanks to Allison's mother in law, I have made these before, but this is a slightly different patterns, although maybe easier?
Basic slipper in easy garter stitch and warm chunky-weight yarn | See more about Garter Stitch, Slippers and Stitches.
Free Knitting Pattern: Yoga Socks
These easy socks are great for the little people in your life, and they'll get you comfortable with the parts of a sock on a small scale if you're new to sock knitting.