"Main Tile Background Contest 2015" will end a week later due to the lack of entries.
Well, in a three weeks, there were only two entries for an annual contest, if you exclude the one I have just added.
So, hurry up and note that you now have even more examples that can give you an idea.
On the other hand, if you don't want to post an entry, please vote for the image that you like the best.