[TheWholeWorldExplodes]

already designed this image

Spoiler (Click to View)


but want to curve the two diagonal lines so they look like this (excuse the crude drawing skills)

Spoiler (Click to View)



basically so I can get a slight curve at the top of two diagonal lines, how would i do this in photoshop?

[lucky.]

My idea would be getting a result through this:
Spoiler (Click to View)
As for the background being stretched inward, you can create a layer below it, or fill in that same layer, with the same color.

[catnib]

You could try using puppet warp or vectors w/ stroke.

[cortz]

Why not use the pen tool. It's easier and less fustrating that any other method.

[zetza]

Eeeeh, just use the pen tool. I suppose you are using Illustrator, just remember to remove or drag the anchor point to the path you created. That way you can go on with your project easily.

You might also want to fix this:
http://prntscr.com/5sja9m