Use these however you desire. Mash them up, put them in your games. If you end up releasing a game using these graphics to the public, all I ask is that you put a link to this website someplace the nether depths of your credits.
They are a few years old, so they are all 128 x 128 images using a common fixed 8-bit palette. I also included a text file that explains the naming convention.
If any of you are new to graphics tiles, here's a little illustration that explains all the parts. You have a set of 14 titles that can be used to make any irregular shape and smoothly transition between two titles. For example. Suppose you had a water title and a land title. With the transition titles, you could easily create a pretty shore line.
Tile creation is a dying art since modern 3D terrain engines have all sorts of wonderful blending capabilities for auto generating transition tiles. But if you are working on a game for handhelds or casual games, it is a nice technique to know.
PS: Here's another picture I found! This is the Colossi, a giant floating airwhale that was genetically engineered to serve as the mothership of a parasitic race of super spies known as Puppeteers.