Good basic plugin

This plugin did what no one else could do with my theme without paying a programmer to build it – it provides previous and next links within a specific category. It would be nice if there were more formatting options without having to go into the theme’s CSS. There is CSS for the text, but it would be nice to be able to control the format of the buttons (colors, 3d options, padding, margins, etc). It would also be nice to be able to add labels/prefixes to the post title (vs generic navigation labels), for example, arrows or carets to indicate that you are moving in a direction: “← [Post Title]” or “Previous Post: [Post Title]” instead of just “[Post Title]”