Is it possible to create a completely free appliance?

And by free I mean free of mono.

I imagine so, you just need to start with a minimal install and build
from that. Use a different DE than Gnome.

Cheers Malcolm °¿° (Linux Counter #276890)
SUSE Linux Enterprise Desktop 11 (x86_64) Kernel
up 12 days 7:40, 4 users, load average: 0.60, 0.24, 0.14
GPU GeForce 8600 GTS Silent - CUDA Driver Version: 190.18

OK, I will give that a try thanks.