The way ro design and create wallpaper...?

Question

please teach me how n the software which can i use 2...
(free 1)

Answer 1

Taking into account that wallpaper is an image of traditional formats, the conclusion is arrived of any image editor (mspaint) makes the task...
But I suppose that you want to give those effects and filters in the images...
http://www.majorgeeks.com/Free_Image_Editor_d5455.html
Excuse if I didn't help...