Hi Serenok, welcome to the forums

For graphics, I would recommend SDL (Simple Direct-media Library).

You can get the SDL DLLs (windows), and .so files for linux here:

http://www.libsdl.org/

You can get freepascal/Delphi bindings for this here:

http://sourceforge.net/projects/jedi-sdl/

There are lots of tutorials around on the net, and the Jedi-SDL code comes with demos too

With SDL, you can make programs what will work with minimal changes on Win32, Linux, Max OSX, and other platforms (even handheld devices like the gp2x).

I hope this helps

cheers,
Paul