Here is my entry for logo contest of steemtuner.I Don't know how to make logo,but i can give some concept,if you like you can use this. 
As everyone know that steemtuner is for all the steemians all over the world.They don't know any country and trying their best to help others.and the main theme is:
You!the architect of your destiny
i suggest to add a world map in the logo.Then write steemtuner. 