The best padded heart pattern I've come across is Caroline Wilbor's Little Heart Bunting from the Wool Bar, Warwick Street, Worthing.
I made the bunting, adding a letter to each heart for to make named bunting. The letters are cut from felt and embellished with a little flower sequin.
From this came the idea to knit a tattoo for Mothers' Day. It was hard to find a box (shadow) frame the right size and depth, to stop the heart pressing up against the glass. I resolved this by reducing the stuffing. "MUM" is hand stitched to a felt banner, and attached to the back of the frame.
Also available - I "heart" U, 'forever' and can be personalised for Valentines Day.
Selling for £10 at The Wool Bar and Mooey's Mocha Shop, Worthing