I must admit in the end I went in a completely different direction with this box although your suggestion sounded great. (I didn't want to buy more stuff though.)
If I could change anything about it I would use white wood stain instead of acrylic colours next time and also paint the box before adding the mosaics. The acrylic colour made it kinda rough although I carefully sanded it before painting and I had to be very careful around the mosaic tiles too. Apart from that I'm satisfied.
Some may yell and jump at how kitschy it is. Yup, it totally is, I admit. I'm shocked at what I did.
This box will be used to store my doll jewelry though and I think it fits the doll room quite well. I wouldn't place it in our livingroom but I still have 5 other boxes to decorate! Can't wait to try my new woodburning pen, although I'm usually quite weary of techical devices, especially if they get hot.