A few nice heart image images I found:
Jesuslovesmesoftsiggymerg
Image by mimitalks, married, under grace
for personal use only under Creative Commons. What you see in black is transparent in the .png version. Access it through original size.
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another fairly current design, done in 2011:
Make a paper-pieced Valentine of your very own, my treat:
www.flickr.com/photos/mimitalks/5417409793/in/photostream
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Set on Flickr of all my (for personal use only) Valentine printable designs