It is possible to do as you want already using custom CSS. Whilst we do intend to make the form and its elements more easily styled with V3 of our plugin (due in a few months), it is doubtful we could meet every styling need out of the box.
Whilst I could not do this until the coming weekend at the earliest, but you would need to show me, with one or more annotated screenshot(s), the design change(s) you want? If you can do that, you would need to upload the screenshot image(s) to a file sharing site (like the WordPress Cloudup site, Google Drive, Weshare, Dropbox etc.) and share the link with me?
I would also need a live link/URL to your search page so I can take a look and work with what is there.
Most important is to know colors, fonts (name, weight, size, etc), border thickness and radius.
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