There are a few very skilled cardmakers on YouTube. I can highly recommand this woman, for one. I gave her Christmas window card as presented in this tutorial a try. Of course, since I can't get these ready-made frames under the rock where I live, I had to cut out each and every one of them by hand. You can see the difference here - mine are a lot more amateurish, of course. But without the fancy ready-made parts, I'm actually fairly proud of my results.

*Edited because I've messed up the hand-coding. Again.