One of my favorite designers is Tatsiana from Lilla Björn blog. When she published this heart pattern, I was totally in love. You can find the pattern from her blog for free and from Ravelry download for small compensation.
I made the hearts from Catania yarn and with 3 mm hook. The design may look challenging but if you read the instructions carefully and follow them step by step, I promise that you can do that lovely heart. These cuties are, for example, a very good idea for Valentines Day!