If you're having difficulties creating images, then give Pablo by Buffer a go. It's a really simple product - you get a series of backgrounds, or you can provide your own, quotes - or you can provide your own. You can have blurred backgrounds with or without contrast and in colour or black and white. You can then choose to have the image made available in square, tall, wide etc for different social media backgrounds. Nice and easy, and though it's simple it's great to knock something up in under a minute.