My two favorite valentine sets are both retired Stampin Up sets: One set is 'Animal Valentines'. The other set (I don't have the set name) is 4 stamps of cows for various occasions, one of which is a Cupid Cow for Valentine's day. Both sets have very cute images and are great for coloring is that's something you enjoy. These sets are commonly for sale on eBay.
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"May your mind whirl joyful cartwheels of creativity." - Jonathan Lockwood Huie.