You can add these CSS blocks to your Thesis -> Custom CSS screen

1. Change the logo background color to transparent

#title_area a, #site_title, #site_title a, #site_title a:hover, #title_area {
    background-color: transparent !important;
}

2. Change the slider header white background

#featured-area .flex-caption h1, #featured-area .flex-caption h2, #featured-area .flex-caption h3 {
    background: #CCC;
}

3. Change Menu Static Colors

.menu a, .menu .current a, .menu .current-cat a, .menu .current-menu-item a {background: #000; color: #fff;}

4. Change Menu Highlights

.menu a:hover, .menu .current ul a:hover, .menu .current-cat ul a:hover, .menu .current-parent a:hover, .menu .current-menu-item ul a:hover, .menu .current-menu-ancestor a:hover {background: #000; color: #fff;}

5. Change the border between sections

.section-columns {background: none; border-top: 1px #ccc solid;}

6. Remove color overlay on certain posts only

.full-width-articles .post-114 .backstretch {opacity: 1;}

Change .post-114 to match the specific post ID's of the posts you want to target.

7. Show images in slider content on mobile (hidden by default)

@media only screen and (max-width: 600px) { 
    body .flexslider .slides .flex-caption img {
        display: block;
        float: none;
        max-width: 100%;
    }
    body .flex-caption .wrap {
        margin-top: 0 !important;
    }
}