Here is a link to the ColorBox Petal Point ink pads. I have several of these in different color combinations and love them. You can find them at Michaels and Hobby Lobby and use a coupon which makes them pretty reasonable.
I don't use colored inks for the majority of my stamping, but use Versafine Onyx for stamping all my images, clear stamps and rubber alike. I like stamping in black ink, and then coloring my images with markers or pencils, rather than stamping in color.
When I do need color, the ColorBox sets give me the option of having many colors to choose from. They are a pigment ink which works especially well with clear stamps and I have lots of those.
Clearsnap ColorBox Pigment Ink Petal Point Option Pad: Enchantment - 080000-08002 - RitzCamera.com