This one is commonly called a "Red Headed Irishman"
This was labeled "Sweetheart Cactus", but I believe the proper name is Parodia haselbergii.
And this unusual looking one is called a Gymnocalycium stenopleurum. I love the colors and can't wait until the blooms open.
To see what is blooming around the country on "Bloomin Tuesday"please visit "Ms Green Thumb Jeans"