I need your help!

Louis and I attend a lot of craft shows and while we don't always get a lot of time to look around and see what everyone is selling or making, sometimes there is something that really stands out to you.
Last year I saw these beautiful heart shaped display boxes which just screamed out to me to fill with flowers. I brought one and gave it a try.
This is my first attempt.
It looks amazing, but you can't really see the heart shapes of the boxes.
I brought three more boxes and some sparkly backing at the next craft show we were at and thought I would give it another go.
Here is the plain box.
After a lot of thought and consulting with Dylan, I managed to coerce him into painting the boxes for me. He chose to make the insides black and painted two in cream and one in blue. He was very kind and used his miniature figurines spray paints, so the cream boxes are actually in skelton bone.
These are boxes after I forced dylan into painting them.
I then added the sparkly backing I had to the front.
These are the finished boxes.
I am now trying to decide what flowers to put in them and what colour I should make them. If you have any ideas or suggestions please let me know by commenting below, thank you!
The boxes and sparkles came from https://rosspapercraft.co.uk/product/heart-display-box/, however, you can see him at most of the same craft shows that we are at, tell him I sent you!