So you can tell, as far as for me, handmade cards are the way to go. Although I have seen some strikingly beautiful clean and simple handmade cards, which are great for mailing, most of the "flat" cards can be... well... let's just say "plain & ordinary!" I prefer cards that "stand out" from the crowd!
In the following video, Christina shows how to use mats and layers on your cards to make them go from boring to WOW!
Watch on YouTube: HERE
Did you notice how different the card looks once she was done with it, compared to the "flat" version at the beginning? Mats and layers, along with some dimensional foam tape at times, can make all the difference in the world!