I have created 2 Fedora 21 images for the HummingBoard and Cubox-i.
http://vps1.mkreder.com/Fedora-Mate-armhfp-21-5-sda.raw.xz
MATE
http://vps1.mkreder.com/Fedora-LXDE-armhfp-21-5-sda.raw.xz
LXDE
I will create a XFCE based image too, soon.
In order to extend the root filesystem on this image, you need to run:
fdisk /dev/location-of-your-fedora-arm-media << EOF
d
3
n
p
2001954
w
EOF
partprobe /dev/location-of-your-fedora-arm-media
e2fsck -f /dev/location-of-your-fedora-arm-media3
resize2fs /dev/location-of-your-fedora-arm-media3
More information about Fedora on these boards can be found on this github page
Matias Kreder 
You can use virt-resize (http://libguestfs.org/virt-resize.1.html), part of libguestfs, to expand in a safer way (no need to be root, for example) partitions within a disk image.
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How well is the graphics card working under Fedora 21? I’m also interested in the hardware accelerated video playback with VLC or mplayer.
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Cristian, The interface is working ok. It is usable. However VLC is still giving black screen on playback. I am working on that.
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