I will show you a very nice technique to create 3D servers
Click to enlarge Or you can see another variation:
Start with a new document. Size 600x600 Pixels with a white background

Create a rectangle using rectangular shape tool.
Double click the layer to open layer style window. Apply settings as shown.
Press Ctrl+T. Right Click and select Warp. Select "Arch" from the preset warp shapes. Adjust settings as shown.

Make an antique scale with a 3D feel using shape layers and layer styles in this tutorial for Photoshop. If you take the extra time to make each coin a separate shape layer, this will be almost 100% vector and can easily scale to any size.

This tutorial will aide you in transforming a flat design into a three dimensional packshot that is great for spicing up those product presentations.

Start with a new document 400x400 px with a white Background.
Create a new layer ( press Ctrl+Shift+Alt+N )
Select the Rounded Rectangle Tool ( radius set to 40 px ) and draw a small rectangle:

Open a new document in photoshop with a grey background
Size should be 600 x 300 ( it is not so important )
I will show you how to create for a single object
Grab the Type tool and write a question mark ( choose a big font )

Start a new document in photoshop
Size should be 500 X 500 pixels
Background color: White
Then Select rectangle tool and create a shape ( hold the Shift key when you are drawing the shape - in this way your shape will be a perfect square)

Open a new document 500x500 pixels with a white background
Then create a new layer. ( Press Shift+Ctrl+N )
Select Rectangular Marquee Tool (M) and make a selection like mine:

Editor's Pick in Photoshop Tutorials
Oh Yeah! Photoshop geeks, this is a good tutorial to Create a 3D Logo. The author explains it so even a newby gets the best and quickest way to make a great graphic. The pictures and screenshots really make it a snap.

Open a new document:
500x500 pixels will be very good.
Then download the shape from the attachment area.
Load the shape