These are some of the images I’ve used for carving and engraving various things. They are not mine, they are images I’ve found on the internet. Most of them (I think) are in the public domain, or have a creative commons license. Since I’ve only used them for one-off personal items I admit I haven’t worried about that too much. If you use any of these images for any commercial product, then I suggest you need to find out the copyright situation for yourself.