(currently retired)
PatColumRow is a dingbat font of pattern parts. As the name suggests, the parts are meant to be formed in columns or rows. Thus to get a pattern which makes sense, one could type in AAAA for the first line, then aaaa for the second line, and they repeat this sequence as many times as desired. Most of the patterns are row patterns, as in the above example. All the letter keys have the sequences on the upper and lower case keys, and all are row patterns. The column patterns are on the number keys and on the `, -, +, [, and ] keys. To see them, a sequence such as 1!1!1!, repeated for as many lines as one likes, is needed. Note that this is very different from the checkerboard patterns on PatCzeckers. In PatCzeckers, the second line would be !1!1!1.
One cannot see what the effects will be unless one tries out the patterns. Some are quite geometrical because many of the patterns were taken from the literature on tiling, which is a subtopic of mathematics.