One of the first rocks my son ever gave me was a heart rock, I use it for a paper weight on my desk. He colored all over it and it's a reminder to me of his sweetness. He has an eye for finding heart rocks and heart shaped things.
Take this bowl of heart rocks, he found most of them for me. I've been using DecoArt Matte Medium to glue little sentiments and quotes on them., they look great in a bowl I painted black. It sits on our dining room table -- it's a unique and fun centerpiece with LOTS of meaning!