I’m not an artist or graphic designer, I just did it for fun. And here is my contest submission.
LIVE example – I set up test account so it’s easy to see how it behave on different devices/social accounts. Don’t forget to check how they look on different devices horizontally and vertically - TV, desktop, tablet, smartphone.
-You Tube - square avatar and background
https://www.youtube.com/channel/UCZqXonL0sAD239klaVOtoVA
-Google+ - circular avatar and background
https://plus.google.com/u/0/100669414468598596747

I made it in Corel Draw using vector graphics which means I can give You original file – and using i.e. Corel Draw, You can literally change anything You want the way You want it – i.e. colors, sizes, add/remove things, etc. Here are some examples:
http://imgur.com/PePjDng

I didn’t use crypto coins symbols cause I don’t know if You can use them commercially without license but You can easily add them if You want – i.e. like this:
http://imgur.com/VCSwqAx