Decorating for Easter would probably be a bit inappropriate.
Decorating for the celebration of Ostara, however, which marks the turning of the seasons, the renewal of life as spring starts, of new beginnings and growth... fill your boots, IMO.
There has always been an appropriation of festivals; chicks, blossom and baby bunnies don't actually scream representation of the crucifixion of the son of God - and yet have also been part of the season for centuries.