Today I just want to share my little experience. Before some days (5th May) I changed my blog's theme (replaced free theme with a new highly responsive premium theme). After changing the theme I saw a major boost up (about 25%) in my traffic with out any new article, link building or promotion. Although my previous theme was also responsive but new theme is tremendously awesome (from my point of view).
New picture added after asking for more info by some warriors:
What I learned form this event?
Out look/Design/Theme is very important for SEO ranking. So always use clean coded, responsive and attractive theme for maximum return.
I would love to hear your experience (if any)