I had a new baby girl recently and I have 2 boys already and I just couldn't see putting a new little pink fluffy girl in a boyish car seat!
I don't have $100 extra dollars around to spend on a new pink one so I just pulled out the cover and using a brown paper sack I traced around it and made a pattern! I think it turned out really cute!

You want to make sure you make your new cover that will go OVER the original padded cover that came on the carseat, you need to have that on there for proper safety. Now about the carseat, I just took out the cover that came in the carseat and washed it, it had been in the garage for a couple of years so I wanted to get the yuck off it. :) I would suggest letting it hang to dry and NOT dry in the dryer, it'll make it last longer. I used paper sacks from the grocery store and cut them out so they lay flat and just laid the cover out and drew around it. I then cut one and sewed it out of an old cheap sheet to see if it fit properly and it did, so then I went ahead and made one out of the nice fabric. I just sort of winged it on the canopy, but you can pretty much do the same thing on that. I hope this helps! The main thing is make one out of scrap first so you don't waste any fabric. HTH, Julie