Collocations for decorate - verb

elaborately, gaily (old-fashioned), heavily, intricately, lavishly, ornately, richly
The room was lavishly decorated with tinsel.

beautifully, elegantly, nicely, tastefully
simply, sparsely (esp. AmE)

with
Decorate the cake with raspberries and whipped cream.

nicely, pleasantly, tastefully
The bedrooms are tastefully decorated.

simply

in
The room is decorated in pale blues and greens.

for
He was decorated for bravery.

highly decorated
the most highly decorated unit in the army

Decorate is used with these nouns as the object:
altar, apartment, bathroom, bedroom, cake, exterior, flat, home, house, interior, room, wall, yard