TIP: After working on a project take 10 or 15 minutes to make a few cards out of the scraps leftover. You will be surprised at how many you can get done. Why? You ask... You have all the coordinating papers and embellishments out and matched up.
I am a fast scrapbooker and card maker because I keep shapes simple. I use the scrap papers I have, Maybe cutting off a small piece here and there, but for the most part I use the sizes they are and layer them. Keep your cards simple! Most people throw a card away after a couple days, so don't put too much effort into it.