Sending out cards, letters, and notes is something I like to do. Mainly, I love decorating the envelope or shipping package so that when the person receives it, they'll know I think they're pretty special.
Here's a super easy and colorful DIY for making envelopes from Fellow Fellow. You might also like them to store receipts in or clippings and keep them on your work desk or spare drawer. Or... hand write a love note, seal it in a little envelope, and tuck it in a spot where your husband, wife, partner, boyfriend, girlfriend, child, sibling, friend, a complete stranger, or your very own self will find it later.
It'll be a nice surprise, don't you think?