I kept making a fairly wobbly version until I stumbled upon Sam's tutorial here. Sam is in the UK and is so clever at these things & she thought to add feet to the box - brilliant!! I adapted her box slightly as my tools work in imperial (rather than metric), so here are the dimensions that I used in mine:
Cardstock base 6 x 7.5″
Score at 1.5, 2.25, 4.75 and 5.5″ (on long side)
Score at 1 and 5″ (on short side)
And here's a link to Sam's video where she makes her metric version.
For my box, I used basic black cardstock & modern medley dsp. I also used the rosettle bigz die from the Occasions catalog and 2 pieces of coordinations cardstock, one in primrose petals & one in real red, to make my flower embellishment. I *luv* making these flowers/roses...must be the 'roses in my heart' I guess;)