I just remembered I had started doing this.
http://twiikuu.free.fr/tf2/omp/omplelay.png
Download it here: http://twiikuu.free.fr/tf2/omp/omplelay.mumblelay (Might have to rightclick/download that one.)
Or make a new .txt file and rename it *.mumblelay
[overlay] omp/tf2hud http://rawr.am/tf2hud/ adapted to mumblelay by twiikuu
avatarshow=false
channelcolor=@Variant(\0\0\0\x43\x1\xff\xff\0\0\0\0\0\0\0\0)
channelrect="@Variant(\0\0\0\x14?\xbd\xbc'\x9c\x8c\xbfQ\xbf\x8f\x9a\xdd<\f\xa4X?J\xf8\x34@\xe5=\xbc?\x9f\x9a\xdd<\f\xa4X)"
fillcolor=@Variant(\0\0\0\x43\x1\xdc\xdc\0\0\0\0\0\0\0\0)
mutedopacity=0.25
mutedrect="@Variant(\0\0\0\x14\xbf\xb1\xf1\x96\x90\xe0\x85\x80\xbf\x8fz\x80\x30\x8b\x91\x41?\x9f\x92\xc5\xf9,_\x92?\x9fz\x80\x30\x8b\x91\x41)"
padding=0.002
pencolor=@Variant(\0\0\0\x43\x1\0\0\0\0\0\0\0\0\0\0)
states\3\color=@Variant(\0\0\0\x43\x1\xff\xff\0\0\xff\xff\xff\xff\0\0)
states\4\color=@Variant(\0\0\0\x43\x1\xff\xff\xff\xff\0\0\xff\xff\0\0)
useralign=130
userfont=@Variant(\0\0\0@\0\0\0\"\0\x46\0u\0t\0u\0r\0\x61\0 \0S\0t\0\x64\0 \0M\0\x65\0\x64\0i\0u\0m@4\0\0\0\0\0\0\xff\xff\xff\xff\x5\x1\0\x32\x10)
userrect=@Variant(\0\0\0\x14\xbf\xb1\xf1\x96\x90\xe0\x85\x80\xbf\x8fz\x80\x30\x8b\x91\x42?\xc7\xf0\xd4\x62\x9b\x7f\r?\x9fz\x80\x30\x8b\x91\x42)
avatarrect="@Variant(\0\0\0\x14\xbf\xb1\xf1\x96\x90\xe0\x85\x80\xbf\x8fz\x80\x30\x8b\x91\x41?\x9f\x92\xc5\xf9,_\x92?\x9f\x92\xc5\xf9,_\x92)"
You then import that file into your Mumble settings.
If the font appears to be wrong or bugged, make sure you've installed the fonts provided in omp's hud package, and change it through the Overlay editor in Mumble.