You can adapt the idea to suite the materials you have at hand.
Start with a singlefold base card from Regal Craft Cards (available in over 30 colours), and use it in horizontal profile as a base.
All you need to do then is add "stripes" of co ordinating plain and/or patterned papers, and some (optional) stickers to disguise the joins, and you're done. You can of course add embellishments such as the flowers and rhinestones used here (or small stamps, diecuts, pearls etc) and a greeting. Sharon has used a ration of 1/3 at the base to 2/3 above which works well visually.
If you save your scraps in colour-matched snaplock bags you're good to go and this can be a 5 minute card for any occasion.