All files and folder organized nicely.

Check <head> part of the index.html. You will find all colors link available. blue color is active. So if you want to use any other color just replace the "blue" with that color name. or you can remove the comment make other color active.
<!-- COLORS --> <link rel="stylesheet" href="css/colors/blue.css"> <!-- DEFAULT COLOR/ CURRENTLY USING --> <!-- <link rel="stylesheet" href="css/colors/red.css"> --> <!-- <link rel="stylesheet" href="css/colors/green.css"> --> <!-- <link rel="stylesheet" href="css/colors/purple.css"> --> <!-- <link rel="stylesheet" href="css/colors/orange.css"> --> <!-- <link rel="stylesheet" href="css/colors/blue-munsell.css"> --> <!-- <link rel="stylesheet" href="css/colors/slate.css"> --> <!-- <link rel="stylesheet" href="css/colors/yellow.css"> -->
Screenshot:

It's very easy to change your logo. Just take a look at the below screenshot. Change the image link to your own logo.

2 Images used in 2 sections. Header and Call to Action section at the end.
Find this 2 sections in styles.css
Header BG:

Call To Action section BG:

I used 360 font icons set from Elegantthemes, 500+ from ionicons
Example:
<span class="icon_camera_alt"></span>
Just change the image links to your desired screenshots url. That's all.

Contact form will use php to send emails. So just open sendmail.php file. Change the current email spambox@designlab.co to your email address. Your form is ready.

Current active subscribe form will save emails to mail chimp list.
How to connect mail chimp list?
Open custom.js and find following script. Just replace that mailchimp form action url with your mailchimp list url

How to find mailchimp form action URL?
Just go to your mailchimp account. Then create a new list or go to your existing list. Then Signup forms. Select Embedded forms. You will find form action URL in this page.

If you need any help. Feel free to contact me anytime. I will reply in 24 hours.
Send a mail from my Themeforest Profile
Images from unsplash.com
Screenshots from http://themeforest.net/user/themebucket