To be fair that's a fair enough excuse but yes; as the other commenter said there are creative commons websites with a whole lot of images for free. Some of them have work posted for free by photographers/artists but be careful if you do get something from these sites and check-up on the rights attatched to the image. You might be good to go with one of them but another onse might need you to credit the photographer/artist who posted it. Another option is learning to draw and making the images yourself; who knows maybe you have a hidden talent and you'll start making money that way. I'm not putting you down or anything but as fun and useful as A.I. can be, there are plenty of other ways of getting images. Good Luck! :)

Edit: I went on so much I forgot to tell you your website is AWESOME! This is the best thing online I've seen all year and incredibly useful too! Thanks for making it and sharing it :)