ok lets take the list that you posted 2steps and see what we can come up with
2 childs coat hangers - wooden and metal ones
cup - china or other
video tape case - download films
printer - no suggestion
earring stand I use for photographing ebay items - wood
few toys - again wood
cd rom cases - downloads again
speakers - difficult but I am sure you could minimise the amount of plastic on new speakers
pens - pencils or quils perhaps?
joypad - - no suggestion
mouse - no suggestion
keyboard - the bamboo ones shiley talked of
little fillingbox for recipts - cardboard
desk fan - open a window

baby car seat - - no suggestion
mobile phone - you can get ones that the front biodegrades
hair brush - can you get bone ones still, or pehaps wood again would be better, the bristles would be difficult.
sewing machine - - no suggestion
scissors handle - all metal scissors
dvd cases - downloads
telephone - - no suggestion
pc monitor - bamboo possibly
dustbin - metal
cd cases - downloads
baby changing mat - - no suggestion
light switch - metal
light fitting - - no suggestion
some packaging for parcels - just paper and string
Some there that I am not sure of and I guess when buying new consumerables it is worth looking out for alternatives.