I tried searching for interesting blogs using both Bloglines and Technorati. Using the "search for posts" option in Bloglines with the search term "calligrapher" turned up no results. Changing the search option to "search for posts" turned up a few results, but nothing that interested me. I changed the search term to "calligraphy" and tried both options again. This time "search for feeds" turned up posts on a Japanese calligraphy blog and on BibliOdyssey, a blog on books, illustrations, book history, and other aspects of the book arts. Finally I tried the "search the Web" option, and that turned up the most interesting and relevant results, although not all of them are blogs and may or may not have an RSS feed. Interesting to note that Bloglines has partnered with Ask.com for its "search the Web" option. Google has so pervaded the Web that it's easy to forget that there are still several other very useful search engines.
I repeated the exercise using Technorati, searching both posts and blogs for "calligraphy" and "calligrapher," and got an entirely different set of results. I found public domain (mostly) illustrations From Old Books, and Arabic Calligraphy. The posts are mostly in Arabic or romanized Arabic, but the illustrations are still very enjoyable. Technorati also turned up the blog on the website of a calligraphy supplier in the UK.
I first had the impression that Bloglines was only searching the feeds and posts of blogs that other Bloglines subscribers had already subscribed to, but then I saw that some of the blogs it found for my search had zero subscribers. So I can't quite account for the differences, but my overall impression is that Technorati did a better job of finding "what I really wanted," as opposed to "what I asked for."