I'm kind of digging blue and gray, especially for a little boy. Custom Crib Bedding Baby Boy by DandelionBabyblanket on Etsy. Aqua & grey for boy & aqua & pink for girl. Also could add bright citrus green.
Cute mobile All you need is Starch, balloons and string or yarn. Inflate Balloon cover with string or yarn and spray with starch. Alternatively soak the string/yarn in glue and wrap around balloon. Once dry, pop the balloon and remove.