I run the children's programs at the library at which I work so reading pictures books is my favorite work-time activity.
Shark in the Park is a great suggestion, and pretty much anything Julia Donaldson has written is very popular (Gruffalo, Stick Man, etc.).
My favorites are the Emma Dodd and Giles Andreae books. There's a whole series with titles like I Love You, I Love Mum, I Love Dad, I Love Nan, I Love Dogs, I Love Bugs, etc. Always very sweet. Emma Dodd does an animals series that is really sweet.
If you're looking for touch-and-feel board books, I use a lot of the "That's Not My..." series at our Baby and Toddler sessions. Right now we're reading That's Not My Hedgehog, That's Not My Goat, and That's Not My Squirrel. At Christmas I break out the That's Not My Reindeer and That' Not My Elf. These also come in a box set with three or four of the books.
If you want something for when the baby is a little older, the Fairytales Gone Wrong series by Steve Smallman and Neil Price is wonderful. They take classic fairytales and twist them to teach a lesson. For instance, the series includes "Get Some Rest, Sleeping Beauty" and "You're Not Ugly, Duckling." Very good but perhaps a bit too old for a baby shower.
Last but not least, I will suggest the Mike Brownlow and Simon Rickerty "10 Little..." series. I always nab these for Baby and Toddler when they come into the library. Currently there are Ten Little Pirates, Ten Little Princesses, Ten Little Dinosaurs, Ten Little Monsters, and Ten Little Elves.
Goodnight Moon and the Giving Tree are my go-to shower titles, but those tend to be popular in the US. Good luck with whatever you pick out! There are so many good books out that that I am sure you will find something.