Can I use your wallpapers to make my LAYOUT / SKIN / BANNER ?

Unless you can credit Anima Pixella in HIGHLY VISIBLE WAY within your work, no.
Also you must let me know by contact form.

Can I use your wallpaper for my GALLERY?

As long as you don't remove my signature, do not modify my wallpapers & don't hotlink or direct download to my server, yes.
Linking back Anima Pixella next to my wallpaper is a must but contacting me is optional.

Can I use your wallpaper as a base for another one?

No, and do not pretend to go ahead with it, I will not hesitate to report you if done so.

Can you teach me how to do wallpapers?

Try to learn with tutorials, go to Session Zero, and start messing with photoshop!

Where do you get your images?

Go to Image Sources and you'll see =).

I will make money with your walls and you will not stop me!

If you are smart enough you should know everything in life as a price, as much you think you it's silly, what goes around, comes around, keep in mind that you short-minded people.