Put the *.scm files in the GIMP scripts folder (~/.gimp-2.6/scripts/) and refresh scripts (<Image>/Filters/Script-Fu/Refresh Scripts) or restart GIMP.
You will find the scripts then at these places in the GIMP image menu (tail -n1 *.scm):

==> elsamuko-antique-border.scm <==
(script-fu-menu-register "elsamuko-antique-border" _"<Image>/Filters/Decor")

==> elsamuko-che-guevara.scm <==
(script-fu-menu-register "elsamuko-che-guevara" _"<Image>/Filters/Artistic")

==> elsamuko-color-tint.scm <==
(script-fu-menu-register "elsamuko-color-tint" _"<Image>/Colors")

==> elsamuko-cyanotype.scm <==
(script-fu-menu-register "elsamuko-cyanotype" _"<Image>/Filters/Artistic")

==> elsamuko-difference-layers.scm <==
(script-fu-menu-register "elsamuko-difference-layers" _"<Image>/Layer")

==> elsamuko-erosion-sharpen.scm <==
(script-fu-menu-register "elsamuko-erosion-sharpen" _"<Image>/Filters/Enhance")

==> elsamuko-error-level-analysis.scm <==
(script-fu-menu-register "elsamuko-error-level-analysis" _"<Image>/Image")

==> elsamuko-escape-lines.scm <==
(script-fu-menu-register "elsamuko-escape-lines" _"<Image>/Filters/Render")

==> elsamuko-glass-displacement.scm <==
(script-fu-menu-register "elsamuko-glass-displacement" _"<Image>/Filters/Distorts")

==> elsamuko-grain.scm <==
(script-fu-menu-register "elsamuko-grain" _"<Image>/Filters/Generic")

==> elsamuko-lomo.scm <==
(script-fu-menu-register "elsamuko-lomo" _"<Image>/Filters/Light and Shadow")

==> elsamuko-movie-300.scm <==
(script-fu-menu-register "elsamuko-movie-300" _"<Image>/Filters/Artistic")

==> elsamuko-national-geographic.scm <==
(script-fu-menu-register "elsamuko-national-geographic" _"<Image>/Filters/Generic")

==> elsamuko-obama-hope.scm <==
(script-fu-menu-register "elsamuko-obama-hope" _"<Image>/Filters/Artistic")

==> elsamuko-photo-border.scm <==
(script-fu-menu-register "elsamuko-photo-border" _"<Image>/Filters/Generic")

==> elsamuko-photochrom.scm <==
(script-fu-menu-register "elsamuko-photochrom" _"<Image>/Filters/Artistic")

==> elsamuko-rainy-landscape.scm <==
(script-fu-menu-register "elsamuko-rainy-landscape" _"<Image>/Filters/Light and Shadow")

==> elsamuko-slide-with-sprockets.scm <==
(script-fu-menu-register "elsamuko-sprocketholes" _"<Image>/Filters/Decor")

==> elsamuko-sunny-landscape.scm <==
(script-fu-menu-register "elsamuko-sunny-landscape" _"<Image>/Filters/Light and Shadow")

==> elsamuko-technicolor-2-color.scm <==
(script-fu-menu-register "elsamuko-technicolor-2-color" _"<Image>/Colors")

==> elsamuko-technicolor-3-color.scm <==
(script-fu-menu-register "elsamuko-technicolor-3-color" _"<Image>/Colors")

==> elsamuko-wb-puzzle.scm <==
(script-fu-menu-register "elsamuko-wb-puzzle" _"<Image>/Filters/Light and Shadow")

==> mm1-vintage-look.scm <==
(script-fu-menu-register "mm1-vintage-look" _"<Image>/Filters/Artistic")

==> tuxcomputers-split-tone.scm <==
(script-fu-menu-register "tuxcomputers-split-tone" _"<Image>/Script-Fu/Color")

Happy gimping!
elsamuko