Summary

The slots on the box are 15mm wide and 3mm high i designed this with tinkercad im not finished with mine yet but the pictures will give you and idea of what i did and maybe you can show what you did!

Radioshack supplies
2bay battery holder preferably a AAA holder
10mm LED light
switch maybe i used a little knob from my raspberry pi project box..

i used Microsoft heart
http://www.thingiverse.com/thing:668845

you can stand the heart up if you want to make legs for this piece but i thought it would be to bulky so I installed it laying down.

supports on the lid you will need thats all.

Get creative and put more holes around the base of the box so you can run some love ribbon through it.