There was a thread about gender neutral but not plain baby decor a few weeks ago.
Just a heads up - Ikea has quite a lot in at the moment! They have a range with owls, hedgehogs, trees etc' on which would work well with a whole lot of themes and the prices are pretty good. :) £13 for a gro-bag style sleping bag, £10 for a double sided floor blanket, £2 for some wall hooks with cute owls on them etc'.