I use Paper Lion in McKinney for everything. They're located off 75 and Louisiana, I believe. I don't know where you're located but they are so worth it. Great prices and so many cute options for any occasion.
The last shower I threw with some friends was a couples "shower." We had plastic cups made from Swoozies which doubled as a favor for people to take. I don't know how you or your cousin are or the type of shower, but since guys were at this past one I threw, we had the cups say Pryor Pregger Kegger with a picture of a stork and the date. (perfect for the guys to drink beer out of at the party lol) They were realllly cute and everyone loved them. It wasn't much of a foo foo shower though, more like a bbq. :) Just a fun idea.
Also, my mother-in-law does cakes. So good and ridiculously good prices. Her website is under construction but it's www.tastefullyyourscakes.com
Best of luck!