Maps can be done if you use the Pro version of WP Google Maps, where the mashup feature can be used (search this forum for mashup). Geolocation searches cannot yet be done, but it is a feature we wish to add, so it is on our ‘to do’ list.

As for custom styling, it is possible that someone has already done what you want, but I do not recall seeing it.

If you use Chrome, add the SnappySnippet inspector addon, then use it to inspect and make the CSS for what you have now and what you want from a sample page that has the design you need, and then compare and use those code snippets to make your own custom CSS.