Oh most of us that change it so often make the 图标 ourselves.
If 你 ever find an image 你 want to be an 图标 I could always make it for you. XD Ive made probably near a thousand 或者 so 图标 由 now. I really enjoy making them
But essentially 你 搜索 up whatever 你 want an 图标 of, 你 find an image that 你 think would make a good icon, take it to some kind of editting software (or paint if 你 dont plan to do much to it), and at the very least, crop the image to be the size 你 need it to be (square)
你 can get 更多 creative with it the 更多 your practice too
I usually used
link to 编辑 and crop and all cause its like Photoshop but online free and has no downloads. Not as good as Photoshop but definitely plenty enough.