Thunderstrike
One thing to note regarding the process LJN used; each part of the piece was drawn separately (possibly by different artists) so mountains, terrain, vehicles, and characters were then all pasted together to form the final work. You can see up close the different paper of each up close. A cool technique that you wouldn't see in box art nowadays!
Thunderwings, Luna Lasher, and Cannon Blaster
These photos allow us to see the process of creating the card or box art prior to placing the words and text, and package design that would go into each figure or vehicle! Also note, this artwork wasn't used in the final version of the "Thunderwings" or "Luna Lasher" since LJN decided to go with a card instead of a box for these additions -- since you can't see the figures behind the card version with the actual toy taking up the space, it looks as if they went with a standard landscape background for each.
Prototype Art Card:
This is a prototype card art from the early LJN days. Note Tygra and Panthro's different colored outfit and Mumm-Ra's cape! Also, you can see some "immaturity" in the way the faces are drawn. The art is all pen and watercolor and quite small measuring about 6 x 6 inches. And again, the old style of actually affixing the "ThunderCats" and LJN logos to the art itself!
Thunderforce
Well, again another prototype from LJN's latter days. Don't really know what the goal was with this one other than to promote all the toy lines.