Hey, thanks!! Please go crazy with the modifications, I would actually love to see what beautiful mods you would create with it :D
The intention with my packs is to give ppl some cool art to learn or improve their game dev/any skills. So as long as you are having fun with it, I'm happy!
Crediting is cool, but if you don't feel like it, it is ok :) The only thing I really wouldn't like to see is the redistribution of the raw assets.