Anything by Eric Carle..Very Hungry Caterpillar, the Very Busy Spider, Brown Bear Brown bear. My grandson has also taken a liking to the "No, David" books.
Donal Crews train book is good for colors.
Any of the boardbooks you find with texture spots are favorites with my 14 month old. The four year old has recently discovered fairy tales, but they can be a little dark, if you don't explain that it is all make-believe. Have fun. I'm a retired teacher and yesterday my DGS looked at my books and told me it looked like I had my own library. In spite of my husband's complaints I knew I had done the right thing by saving my favorite books.