Colin,
I had a peek around those .tim files and they look promising. I had a look on the web for some info on them, and found that they contain colour pallettes and perhaps the picture itself, but I'm not sure. I made a quick program to look at the colours in the pallettes, and one of them had very "grassy" colours in!
i think we may all have been barking up the wrong tree with regards to the png files which are so easily editable. My evidence? If you look at the pngs which have the cricket ball textures on, you'll notice they have the EA Sports logo and writing on, whereas in the game, the balls have HB Studios logo on.
Also, after a lot of time and fiddling about, I managed this...
It is obviously a ball, but it needs to have a colour pallette assigned to it. I have extracted some other files to look like this (i.e. without colours) so there must be pallettes somewhere - either in the same file or in a different file.
I've found kit files too, but they are way too big to bother uploading. I have actually uploaded a low-quality jpeg of one in cricket2002.tk forums in the thread "Extracting files from *.gob using MultiEX, Good news" if you want to see them.
If anyone else has photoshop or programing knowledge or both, try to figure out what the hell is going on here!!
HB Studios are absolute bastards for making this game so damn hard to edit!