hmmm, I didn't know I was a rocket scientest.. so I'll try to explain the previous WIP pic.. with a new pic...
When I did a search on the net all I found was pics of tetra vex that looked like the first one in the above line of samples.. I made the second variation, then added texture to make it more interesting still, and then thought that perhaps using colors instead of numbers might be an interesting way to go. The first sample showes the tiles in a 4x4 grid which seems to be what all the tetra vex samples I found indicated was the standard grid size.
Sorry for the confusion, but you know what they say be carefull waht you ask for.. hmm, or something like that.
Now, if you want the first version, you don't need graphics, any programmer can draw a box and use the linedraw to make the x then stamp numbers on it. the subsequent ones are visual variations on the original.
Confused yet? Good. I'm still waiting for a decision on which style to go with.
Cheers!