There are many creative possibilities, using everyday materials you can find around your house, or using objects that might be considered garbage/recycling.
Assemblage by Louise Nevelson
A selection of cool wire sculptures, by Alexander Calder (mobile guy, see above) and Gavin Worth (contemporary artist)
Pinterest ideas – wire frame sculptures
Basic wire frame/tissue bowl
More complex wire frame – fox
Wire sculptures with yarn / fabric
Check this out!
12 year old Callum Donovan Grujicich makes really cool figurative sculptures that incorporate found objects: