For a space-saving lamp, hang a lightbulb on a cord off of a wall-mounted shelf bracket. note: this isn't just any old cord and socket or any old bulb. The bracket is carefully chosen too.
Instead of buying a writing desk for the bedroom? DIY desk idea from Apartment Therapy.
Besta Stuva Ikea Hack for kids room - cosy reading nook in pastel colors
Clever use of built-ins to make the most of this small kids bedroom