I’m always on the look out for simple eye-catching ways to communicate a message. I think this is a great example of a visually appealing background that could be used when there are no images, graphics or other ways to improve the typography. This is especially useful in direct marketing (email or mail shot).
How to create it in Illustrator
The first thing you need to do, and it may not be apparent why, is to draw a triangle. How do you draw an equilateral triangle in Illustrator? Easy, simply fetch your Polygon tool from the Toolbar (it may be hiding under the Rectangle or Ellipse tool) and click once on the artboard. Then choose 3 Sides, don’t worry about the Radius. You then need to turn the triangle on it’s side and elongate it so it an isosceles with two long sides and a short base pointing to the left or the right. Don’t worry, it’ll become clear why later!
Now, with the triangle selected, find your Brushes palette and select New Brush… in the drop down menu and choose Art Brush. Notice the direction the brush is pointing in (left), this will be important.
Now draw a curve from the centre of your artboard to the outside, make sure it has a stroke but no fill. Then apply the triangular brush that is now in your brush palette. Now go Object > Expand Appearance. This changes the stroke to a fill which we will need in order to apply a gradient to the curve.
Now the exciting bit (you thought this wasn’t so exciting so far?), option/alt click on the apex of your curve with the Rotate (R) tool selected (see inset left). In the resulting dialog box (left) enter a number that goes into 360 evenly and hit copy. Now, the really exciting bit. Go Cntl/Cmd-D and keep your finger on it. Cool, huh?
Now all you have to do is to apply radial gradients to taste. And serve with some attention grabbing copy lines helped along with some well-crafted typography!