You can use a plastic coated U-shaped tool hanger.
Aldrine has a Uke Minute, episode 50, about them.
I use the more commercial hercules wall hangers - they hold on to the uke until you lift it up and then the arms let go - stops it accidentally falling off (happened to my guitar once and killed it, but never happens with these hangers ).
http://www.herculesstands.com/guitars/GSP38WB.html
Thanks for showing my work Wickedwahine :shaka: I also do plain Jane hangers for those who do not want nautical. Just pm me if interested. Thanks!