siblings should share a room (at some time in their lives!!) - it builds character, provides opportunities to negotiate sharing & getting along with others... some of best memories are bedtime with 2 brother's in bunk beds and my sister and I in a 3 quarter size bed!! ♥
Since you only have one room, no nurseries! Little Man Cave. What a gorgeous little boy's room. Can be "babied" then grow with the "little man."
Good idea for a girl's room if you want to incorporate pink. Brownish walls with pink accents.
baby girl nursery, but could be adapted for boy, too. When I was pregnant with my son, our 2nd bedroom was already this caramel color with white trim I was broke, so I just stenciled white teddy bears with red bow ties all around the top of each wall made a matching lamp using a white stuffed teddy bear with red satin bow as the base.