I've noticed that the style of kippa seems to be an "identity marker" for the "type" of Jew one is.
For example, it seems yeshivish boys wear only plain black kippot. More "modern" young kids seem to be interested in colors and may wear ones with designs or their name on it. Older men may wear a knit kippah. Conservative / Reform shuls tend to use silk / satin "domed" kippot.
Are there any published an online article or hard-copy book / article, etc. that has studied kippa styles?
If you find something, please post as an answer, rather than a comment.