I left a few winged helms on, and did use a few of the stylized shields, but not many.
So far my plan for the shields, standards, etc. is to leave them black. The concept being that such things are beyond the concern of the undead. It seems a bit odd that every single vampire, liche, and necromancer seems to develop a cliche taste for covering everything with skulls and bats. I figure, most of the skeletons are going to be raised and not immediately be sent to the Fashion Consultant of the Dead for a makeover or go on a shopping spree at the local Halloween Outlet...
...although a diorama featuring some plain skeletons going into a tent on one side, and coming out covered in skull & bat decorations on the other, might be a fun project.
I also like that it heightens the contrast between my two armies, with the Marienburgers being more colorful and adorned with detailed standards, etc.