You'll need an 8x8 piece of cardstock, I'm using Baja Breeze. A 6 1/8 x 6 1/8 piece of DSP (if you want a really snug fitting lid you can use a piece of DSP that measures 6 1/16 x 6 1/16), I'm using Walk in the Park. By the way there are only a couple days left of the DSP sale. Remember if you buy 3 you get 1 free! It's a great deal and a super way to stock up on your DSP. You'll also need sticky strip, scissors and 4 pieces of a coordinating cardstock (I'm using Basic Gray) those pieces need to be 4 x 1. I've used the scallop border punch on all of mine.
On your 8x8 piece of cardstock you're going to score at 2 inches all the way around it. Then your cut along the horizontal score lines until you get to the vertical score lines. I like to cut my tabs into triangles. See photo above for better explanation. I think it cuts down on the bulkiness of the box, and it's easier to assemble.
I like to assemble my scallop borders now but you can also wait until your lid is assembled to do it. I prefer to do it in this step because I think it's easier to glue, but I have forgotten them and glued them after it's assembled, so whichever way you prefer works just fine.