Super Contact Form Plugin.
After activating this plugin, simply use the shortcode [scf] wherever you want the Super Contact Form. This shortcode takes no attributes.
You will also want to customize the Super Contact Form plugin from the Settings > Contact options menu. Here you can set the email address to receive submissions, text for legends, labels, and prompts, turn on spam reduction measure(s), etc.
Included with Super Contact Form is a example style sheet file with images. Super Contact Form features dynamic classes, so when an input field is returned to the user for an error-related issue, the input is given the class
And so on. A very simple plugin.