I’ve always wanted to get better at creating a portfolio of good designs that I find. A friend that I used to work with had a file cabinet full of magazine clippings and other things that that they had stored away for inspiration. This was a great resource to spread out on the floor when getting started on a new project.
If you are looking for some inspiration, here is a page of business card examples. Even if you aren’t designing cards, it is a great thing to look through for fonts, colors, alignments, and everything else you need to get the creative juices flowing.