I just wrote this little tool that allows you to replace colors in multiple files. It can be useful when making new critters, but in most cases it's useless just by itself. It's a windows app and needs some .net version installed
http://www.speedyshare.com/files/19558509/FramesColorReplacer_v1.04.zip
http://www.speedyshare.com/files/19558526/FramesColorReplacer_v1.04_Source_VS2008.zip
These are samples of what can be done with simple critters:
http://www.speedyshare.com/files/19509601/HAGROBAA.FRM
http://www.speedyshare.com/files/19511113/HAGROBJB.FRM
These were easy because i replaced colors from the purple robe and there are no purple pixels anywhere else. The color associations i used for these are in the archive. It would probably work ok with dogs and aliens and stuff like that but i don't have any more time to try them now.
http://www.speedyshare.com/files/19558509/FramesColorReplacer_v1.04.zip
http://www.speedyshare.com/files/19558526/FramesColorReplacer_v1.04_Source_VS2008.zip
These are samples of what can be done with simple critters:
http://www.speedyshare.com/files/19509601/HAGROBAA.FRM
http://www.speedyshare.com/files/19511113/HAGROBJB.FRM
These were easy because i replaced colors from the purple robe and there are no purple pixels anywhere else. The color associations i used for these are in the archive. It would probably work ok with dogs and aliens and stuff like that but i don't have any more time to try them now.