I use Photoshop Album. I have tags for fibers, papers, letters/words, metal, etc. So I import the elements into PSA and then tag them (often with more than one tag) so I can find them later. I also add a caption to each element that says the creators name and where I downloaded the element from. These captions are searchable too.

In PSA, you can see a thumbnail of the element or click on it to see a full screen version. Some of the PNG files don't show up too well, but other than that I like handling my elements this way.

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avatar photo by Marja Flick-Buijs downloaded at sxc.hu