Collect everything you need:

Prepare your paper.
Cut Basic white. 20 x 20cm square, 14.3 x 14.3cm square, 9 x 9cm square
Cut Blueberry Bushel cardstock. 14.8 x 29.6cm, score at 14.8cm, cut 4 squares 9.5 x 9.5cm each. Strip 10 x 3cm scored at 4.5 and 5cm.

Cut DSP. 13.5 x 13.5 square, cut 2 squares 9 x 9cm each.

Stick largest square of DSP onto largest square of white card, stick onto front of card.

Mark centre point on right hand edge of card. Stick the small strip to the inside edge as shown to make a closure tab.

Score large white square at 10cm on each side. Score again on the diagonal from corner to corner as shown. Fold and score all lines.

Fold the white square in half on the diagonal line. This needs to line up with centre line of card.

Put Tombow on one of the whole square sections and with the diagonal line of the white square lining up with the centreline of the card base, stick it in place so that it covers most of tab.

Repeat with the other side. Stick 2 Blueberry Bushel squares onto the white card. Decorate the left hand blue square with a die cut from your pack.

Mount one of the 9cm DSP squares onto each of the remaining blue squares and apply all purpose adhesive to one diagonal half of the blue square as shown. Stick it to the right hand side of the folded card as shown in the photo, repeat with the other piece onto the other corner.

Stamp your greeting onto the remaining white square using Blueberry Bushel ink. Add embellishments if you wish and stick onto right hand blue square. Decorate the other blue square using die cuts from the paper pack. 

Add your greeting and more die cuts/ embellishments to the front of the card.

Once this is all done you have the finished card shown below. You can add as few or as many die cuts as you wish.