It is going to be pink pixelated hearts with black background. Maybe quilted with variegated pink thread. I'm using 1.5" squares.
I thought of tear away stuff, pins, leaders and enders but I'm really intrigued by the ultra lightweight fusible webbing trick mentioned earlier. I saw it when I googled for tips and it looks perfect. I may try that but I have to make a run to the fabric store because I only have heavy duty stuff leftover from making garments.