There usually isn't a lot to discuss when someone has a userhead idea. If you'd like to suggest one, please see this official community:
lj_userheads This entry used to be a dropbox for userhead ideas, but I have locked it since it only duplicates the purpose of the official community.
Ideas from past suggestions:
LJ pencil (bonus: retro favicon!)
http://suggestions.livejournal.com/1076387.htmlcrown
http://community.livejournal.com/suggestions/1060419.htmldark pigtails
http://community.livejournal.com/suggestions/1045502.htmldifferent colors for paid/perm
http://community.livejournal.com/suggestions/1017986.html pumpkin
http://community.livejournal.com/suggestions/1042122.html now available