I made a batch of cards and tags a while back with the focus of using some awesome embossing folders. The embossed patterns really steal the show!
I used the We R Memory Keepers Next Level Gemstone embossing folder. It's a set of two and they are both fantastic. This line of embossing folders produce the best results I've ever seen! Though I have to work for them a little bit as they don't perfectly fit in my Cuttlebug. I usually have to add cardboard shims to make it work.