What happens next?

How to make an eyecatching youtube background
Get a decent image editor, such as photoshop or gimp.
Ms paint will not do.
Get a template.

Options: a). Cut out a piece of paper about the size of a grain of sand. Print out the image using a photo editing software, which will take about 2 minutes. b). It will have to be very advanced, like if you sketch from scratch. On the template, set the size of the background using bullet points for the images' edges. c). Edit the template, but remember, if you seen some more popular users with links on there backgrounds, such as facebook and twitter, you can't add them unless you are a youtube partner. Try to use images that reference things you have done in your videos. d). Photoshop is the most common software for making a thumbnail, you can do the output itself or obtain a gimp template from a photo library for, what ever the heck you need, and it might just make well. But what you don't have at home is a concrete idea.
c).