how to create rounded ribbon effect in photoshop

Question

I have already done everything else (like shadow,gradient), but now I'm just stuck at one step.

How can I bend the rectangle (pointed with arrows) to get this rounded ribbon effect:

Answer 1

I think to create that shape you are to use the Pen Tool and just draw the custom shape:

And after that just add Gradients :

Answer 2

Like @Flavius recommended, the shape is best to be drawn as a vector. In his answer, he used the pen tool, but you could use the normal rectangle shape tool and then warp the shape.

After selecting the shape layer you want to modify (in this example the rectangle), choose Edit → Transform [path] → Warp. Or you could click on the warp button from the toolbar while you're Free transforming the layer:

Then you could either use (and modify) some pre-set warps…

… or just warp as you wish with the new warp handles your layer has:

For the best quality it is recommended to use vector graphics (pen tool, paths, shapes, …), but you can use the warp tool with your raster graphics as well.