I was asked recently if there was a way to include a search on a WordPress page (which was essentially a very, very long list of links) so that it was easier for a user to find suitable content quickly. See how I managed this using native jQuery to search and highlight relevant results clearly on the page as the user types.
Contact Form 7 is a wonderful WordPress plugin that’s incredibly flexible, but I’ve never been a big fan of the default arrow-headed ajax loading gif that appears whilst the form’s processing after submission. As of version 4.6 of Contact Form 7 you can now change the loading gif super easily using just CSS. See an example form and the CSS necessary to make this work.