Gimp possibilities
Gimp is a very good image editor. It can edit scaned image, eg photos.
Paint scaned drawings, manga skecths or inked drawings. Or simply create a
image from the nothing.
Gimp have very good filters created by very good developers, and very good
tools. Have blur, motion blur, noise, each filter can be used for
diferrents things, depending of the wanted result. Have pencil, brush and
a spray for paint, each can be used, too, for diferrents things.
Some techniques can be used to improve your images using Gimp resources,
eg yellow supernova + blur = sun or white spray + cian background = sky
with clouds. Using some of these you can create images from nothing.
You can use layers to add nice effects to your image or organize diferrent
things, such as house and scenary.
A good and simple recourse is the text with effect. You draw a WHITE text,
click in it layer, cut, paste in the MASK of other layer. Finished, text
with effect.
Yes, is really a very good image editor and manipulator. But only work
when you know what you are doing. If do not know, just train until know.
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Example of wallpaper made in 15 minutes with Gimp, lap1994.deviantart.com,
check Above The Clouds!