How can I have a 2 in 1 background for my blog?

Guys, I need your help!
I am planning to start a blog, after the fantastic experience I had with my Yola website. The problem is that Yola has nothing 100% suitable for this blog (not even in Pro). I like "Fantastic 36 Sunflower" template but there's not enough space for articles.
I finally decided for a template that allows me change background "No Frills black ". However, this does not seem to help me because I want to include one picture on a golden background (this background is not available in Yola). If I use "tiles" option the photo will reapeat and I do not want that..I need only my golden pattern photo to repeat...could you please take a look and let me know if you have any ideas?? I really do not know ..what if i upload a bigger size photo (photo + golden background)...and if I do...how big should this be??
http://egiptblog.yolasite.com

Many thanks!!!