Looking for someone who is good with pixels

I need some tiles done for my game, these tiles are 50x50px and need to be of a space station theme

They will be used to make maps for Station Invasion and will need to be used in my map maker (http://www.psi.tapt-in.net/mapmaker/)
If you go to the mapmaker, you can clearly see this kind of artwork is a lost cause to me lol, but you get the idea of the application of the tiles and how they will be used.
The kind of tiles i am looking for are as follows.
General floor tiles
Wall tiles (including corners, T sections, X sections and wall ends. Maybe some destroyed walls)
objects like open floor panels etc
and anything else that could be used :p
PSD format is prefered, but stand alone tile images welcomed :p