How to make Abstract Patterns Wallpapers using Irfan View

You can create abstract patterns or images by using various filters in IrfanView. You can either use an existing image or create a new one. Go to edit> show paint dialog from the menu bar to see IrfanView's paints tools.

Create a new image by pressing [ctrl] + [N]. Select the rectangle Tool and set the foreground colour to white. Set the pixel with to about 5 pixels. Next randomly create rectangles if different shapes around your canvas. After that apply the Emboss filter by going to image>Effects>Emboss. Now use the sharpen filter. To do this, just press shift + [s] a number of times till you see a pattern form. Next for a bit of finishing, you can go to image > Effects>Oil paint to smoothen out of edges.
you can try different filter combinations or colours and create these abstract patterns of your own.

To other effect filters are fond of are the Twirl ans Swirl effects. I've found an interesting way to use these with a similar method as mentioned above. Instead of using a single white colour, use different colours for different rectangles and fill the canvas. Next, go to Images> Effects Browser and select Swirl or Twirl, and your network is ready