You'll notice the above card has a lined envelope, because it had a weird logo printed inside. I just deconstructed the envelope and used scraps to line it and then glued it back together.
This card has a cardboard embellishment that I cut out of the backing of a sticker pack. It also has a random thread I found that I thought matched nicely.
Start saving those paper scraps and think of random bits and pieces that you could incorporate. This would be a great way to use up those odds and ends of things you've been saving from your scrapbook/papercrafting stash. Also start saving your used greeting cards and instead of tossing them...come on you know you do...reuse them instead!