These are the valentines I made for my kids this year. I used the same idea for both, but differently for each card.
I started with a plain heart die from Papertrey. I cut one out in black, one in white. Then I used this rainbow circle die from Papertrey to cut the heart into strips.
For Kate's card, I coloured the strips with copics and WoS, put the heart back together and then popped it up over a black circle for some contrast. I used a little PTI sentiment, cut out of its heart.
For Struan's card, I glued the pieces down onto Soft Stone cardstock, leaving a tiny bit of space between the strips (and thus elongating the heart). I left out one strip in the middle - the perfect size for this Sweet Stamp Shoppe sentiment, stamped in Classic Cherry ink.