One thing that I do, is ask that if I give someone a hat, that I get a photo of the person, in the hat that I made for them, for my Ravelry project photos. Fortunately, my family is happy to oblige. :-)
What I also do, is use that photo of them in my contacts/address book, so that when they call me, I see them wearing my hat on my phone screen. Like this:
That is my husband, modeling his Jayne Cobb hat (Firefly fans will know what I'm talking about) and he's is scowling in an entirely Jayne-appropriate manner.
Here are a few others:
My granddaughter is too young for her own contact entry, but if she were, I'd use this photo (because she's a cutie, and this is my favorite photo of her that I've taken):