Le dépôt yum a désormais une nouvelle url.
Il passe de http://drpixel.tuxfamily.org/fedora à http://download.tuxfamily.org/rpm/drpixel/fedora.
Le plus simple pour continuer a l'utiliser est de mettre à jour le package drpixel-release.

rpm -Uvh http://drpixel.tuxfamily.org/fedora/drpixel-release-1-2.noarch.rpm

ou si le dépôt est déjà installé

yum update --enablerepo=drpixel

The yum repository has moved :-)
The new URL is http://download.tuxfamily.org/rpm/drpixel/fedora instead of http://drpixel.tuxfamily.org/fedora.
The easiest way to keep it working is to update the drpixel-release package.

rpm -Uvh http://drpixel.tuxfamily.org/fedora/drpixel-release-1-2.noarch.rpm

or if the repository is already used

yum update --enablerepo=drpixel