Here are some inspiration pictures I found when I was looking for gray and yellow decor ideas:
I like the fun curtains that and textured pillows a lot!
Matt, however, is dying for this type of headboard - he'd pull it right out from the side of a barn if he could!
All above images except the first found via DecorPad
(we are lucky we have a semi-empty room right now beside us)
(Yes Matt is in all these pictures, but only because I am taking them and waiting for him to cut in before I paint too)
Although we still had to bolt the mirror to the wall the next day (which we did), and add hooks behind the door
(which Matt tried to do before puncturing our stupid plaster walls and had to fill it in and get better plaster plugs before attempting it again today). Again - it's all a long (but very fun) process!