For
DD's 1st birthday next month i am going with a butterfly theme.
You could just do a cake or get a cake made in the shape of a butterfly or even just a garden with butterflies and lady birds?
You can make your own butterfly wings out of stockings and wire coat hangers for any little girls that attend and maybe for any boys they could be some kind of bug?
You could go with a music theme, does she like any song in particular?
Get old CD's or something and hang them around as decorations?
Not sure if this helps.. have fun!