Photograph incidental hearts in nature and send the pictures when you're apart.
Source: Flickr user Anne Worner
Take a photo at night using time-lapse, and write it out in the sky.
Craft them a special keepsake.
Source: Hey Paul Studios
Tell them with a treat or on top of their favorite dessert.
Source: Flickr user rhoftonphoto
Leave them a funny love note somewhere surprising.
Source: Flickr user andrajos
Give them a collector's copy of their favorite book with a sweet note inside from you.
Source: Flickr user katerha
Draw it in the sand or snow.
Source: Flickr user James Wellington
Skip texting, and mail them a handmade love letter instead.
Source: Instagram user foreverheyday
Write it on the mirror so they see it when they get out of the shower.
Image Source: Thinkstock / dayice
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Sing it in a song — even if singing isn't your strong point.
Image Source: Shutterstock