When I'm feeling particularly homesick (I tend to use the term loosely, usually meaning that I'm homesick for someone I love), I like to try and remember the feeling of holding their hand. I can clearly recall the feeling of about seven people's hands and one dog.
See if you can mentally recollect how a certain person's hands feel when you hold them.
It's surprisingly soothing and comforting to the soul. And for me, reminds me of those that are the very, very closest to my heart.