I 've been trying to create a special frame/border for my pictures of my paintings, similar to the one I saw on this website.
Can you help me create a similar frame? Thanks.
It sounds like a job for the Freeform Pen tool! Using the Freeform Pen you can create the irregular shapes you're looking for. After you create the border, I'll show you an easy way to frame your artwork using a Clipping path. It sounds hard, but it's not. Just follow along.
Create a new Photoshop document
Select the Freeform Pen tool
Select the Shape Layer option
Set the color to Black.
Draw a rectangular shape by clicking and dragging. Don't worry if it's not perfect, you want your shape to be random.
Set the color to White
Draw a second rectangular shape within the first.
A second layer is created.
By combining two simple irregular shapes you've created a frame for your art.
If you're comfortable with the Pen tools and Bezier points, you can adjust the shapes using the Direct Selection tool. Otherwise just delete the layer and start over again.
Here's the fun part.
Copy and paste a new layer containing your artwork.
Drag the Layer to the top of the layer stack, if it is not already.
Activate your artwork layer by single-clicking it.
Choose Layer > Create Clipping Mask (Ctrl + G)
You art is grouped with the white shape as indicated in the Layer palette by the indent and the arrow.
Use the Move tool to position your artwork in the frame. You can even transform the artwork to make it fit perfectly. Since the Shape Layers are vector objects, they can be re-sized without any loss in quality. Bonus.