Car seat covers???

Alright mamas I need your help! I'm a FTM and a lady at the church I work at gave me a very nice car seat that's almost brand new. I love it!!! But my only problem with it is that it's green because she had a boy and I'm having a girl. Is there any covers for the inside of a car seat and not just the ones that lay over the top to protect the baby from weather? I've tried looking but I can't seem to find anything. ☹